TOEFL Build a Sentence measures sentence structure by asking you to arrange words or phrases. In questions, the key decision is whether the clause is a direct question or embedded inside another sentence.
Identify the clause type and its operator
Before arranging pieces, find the finite verb—the verb marked for tense or paired with a modal. Then ask whether the words form a direct question, an embedded question, or a statement containing reported information.
- direct: “Why did the lecture end early?”
- embedded in a question: “Do you know why the lecture ended early?”
- embedded in a statement: “I understand why the lecture ended early.”
Only the direct clause uses auxiliary–subject inversion. In the embedded versions, why connects a clause with ordinary subject–verb order. The opening “Do you know” already carries the question grammar.
If a modal is present, it serves as the operator: “Where can visitors park?” Keep the main verb in its base form. Not “Where can visitors parked?” With perfect aspect, move only the first auxiliary: “Why has the session been canceled?”
Distinguish subject and object questions
When the question word is the subject, do not add do:
“Who coordinates the internship program?”
Unknown person = subject; coordinates agrees with it. In “Who does the coordinator contact?”, the coordinator is the subject and who is the object, so does appears.
Use a replacement test. “Someone coordinates the program” becomes “Who coordinates the program?” “The coordinator contacts someone” becomes “Who does the coordinator contact?” The position of someone reveals the role.
The same distinction applies to what: “What caused the delay?” versus “What did the delay cause?” In the first, what caused something; in the second, the delay caused something.
Pattern: question word + auxiliary + subject + main verb.
“When does the library close?”
“Why did the committee postpone the vote?”
If be is the main verb, it moves before the subject: “Where is the advising office?” Do not add do: not “Where does the office be?”
Embedded questions keep statement order
Whether and if introduce yes/no alternatives: “Could you confirm whether the fee includes materials?” There is no inversion inside the embedded clause. Whether is especially clear before or not and after a preposition: “The decision depends on whether the room is available.”
An infinitive can compress a question about a suitable action: “Could you explain where to submit the form?” The implied subject is understood from context. Do not combine patterns as “where should to submit.” Choose either “where we should submit” or “where to submit.”
Understanding is only the first step.
Lyra Practice helps you retrieve and use high-value workplace expressions in realistic situations until they feel natural.
Start a practice session →Keep multiword units intact
Particles and prepositions may look movable but belong to a lexical unit. Sign up for a workshop, look into a complaint, hand in an assignment, and follow up on a request should guide the order.
Pieces: the complaint / who / will / look into.
Result: “Who will look into the complaint?” Here who is the subject, will is the modal, and look into remains intact. “Into who will look the complaint” fails both clause order and lexical structure.
Time and manner phrases usually follow the object: “How can students submit the form electronically?” If a long adverbial creates ambiguity, place it at the edge: “Before orientation, where should international students collect their cards?”
“Could you tell me when the library closes?”
“I wonder why the committee postponed the vote.”
The larger sentence may be a question, but the embedded clause uses subject before verb. Avoid “Could you tell me when does the library close?”
Let collocations constrain the order
Fixed partnerships help:
- submit an assignment by Friday;
- register for a seminar online;
- reserve a room in advance;
- apply for financial aid.
Pieces: where / can / students / apply / for financial aid.
Result: “Where can students apply for financial aid?” The collocation apply for keeps the preposition attached to its job.
Worked arrangement set
Arrange each original set before reading the answer.
- why / has / the laboratory / been closed / since Monday
- could you explain / the access code / where / students / can find
- which workshops / include / practical training
- the adviser / who / did / recommend / for the position
- whether / the application / do you know / requires / two references
- how many courses / new students / should / take / initially
Answers and rationales
- “Why has the laboratory been closed since Monday?” Direct question: has precedes the subject; been closed stays together; the duration phrase follows.
- “Could you explain where students can find the access code?” The outer clause carries inversion; embedded students can find keeps statement order and its object.
- “Which workshops include practical training?” Which workshops is the subject, so no do is needed.
- “Who did the adviser recommend for the position?” Who is the object of recommend; did precedes the subject and forces base-form recommend.
- “Do you know whether the application requires two references?” The yes/no embedded clause follows whether in statement order.
- “How many courses should new students take initially?” The entire quantified noun phrase is the object; modal should precedes the subject.
Detect distractor-like grammatical traps
Even when every supplied piece must be used, several local combinations can look plausible. Build the clause spine before attaching details.
For when / the revised schedule / will / be published / do you know, the spine of the outer question is Do you know…? The embedded spine is the revised schedule will be published. Add when at its front: “Do you know when the revised schedule will be published?” Starting with “When will…” encourages incorrect inversion inside the embedded clause.
Agreement can identify the subject. In which of these courses / requires / laboratory work, singular requires agrees with singular head which, despite nearby plural courses: “Which of these courses requires laboratory work?”
Meaning also eliminates grammatical but implausible orders. “Which adviser did the student recommend?” and “Which student did the adviser recommend?” are both grammatical; the supplied noun phrases and context must determine agency. Read the completed proposition, not just its pattern.
Controlled error correction
- “Where does the advising office is?”
- “Could you tell me when will registration open?”
- “Who does coordinate the evening program?”
- “Why did the committee postponed the vote?”
- “Do you know where should submit the receipt?”
Corrections
- “Where is the advising office?” Main-verb be inverts directly; does is unnecessary.
- “Could you tell me when registration will open?” The embedded clause keeps subject before modal.
- “Who coordinates the evening program?” Who is the subject, so ordinary agreement replaces does.
- “Why did the committee postpone the vote?” Did carries past tense; the main verb returns to base form.
- Either “Do you know where we should submit the receipt?” or “Do you know where to submit the receipt?” A finite modal needs an expressed subject; the infinitive pattern does not use should.
A deterministic solving routine
First, circle interrogative words. Second, underline finite auxiliaries or tense-marked verbs. Third, identify the likely subject and core verb. Fourth, decide whether each interrogative begins the whole question or an embedded clause. Fifth, attach objects and fixed collocations. Last, add time, place, and manner phrases where their relationship is unambiguous.
Verify with four checks: every piece is used once; the tense appears only where needed; subject–verb agreement holds; and the result communicates a plausible message. Reading aloud can reveal a problem, but grammatical checks explain it.
Transformation drill
Convert each direct question into an embedded form:
- “Where are the interviews held?” → “Could you tell me where the interviews are held?”
- “Why did the fee increase?” → “Do you know why the fee increased?”
- “Who manages the equipment desk?” → “I wonder who manages the equipment desk.”
- “Does the workshop require registration?” → “Could you confirm whether the workshop requires registration?”
The first loses inversion inside the embedded clause. The second removes did and returns past tense to increased. The third changes no internal order because who is the subject. The fourth converts a yes/no question to a whether clause and changes does…require to requires.
Now reverse them. “Do you know when registration opens?” becomes “When does registration open?” The tense moves from opens to does, leaving base-form open. “I wonder who approved the request” becomes “Who approved the request?” because the interrogative remains the subject and no auxiliary is added.
Arrange these:
- the workshop / what time / begin / does → “What time does the workshop begin?”
- whether / do you know / is available / the room → “Do you know whether the room is available?”
- for the course / who / should / register → “Who should register for the course?”
In item 3, who is the subject, so no extra subject follows.
Build your own pairs: one direct question and one embedded version. Read the complete sentence aloud to test whether the order forms a meaningful campus message.
To practise grammar and collocations as complete language choices, try Lyra Practice.
Sources
Related
- TOEFL Vocabulary Practice
- Exam English Practice
- TOEFL Build a Sentence: Collocations That Fit
- TOEFL Vocabulary Mistakes
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