Flag causes two structural mistakes more often than any others, and both come from the same root cause.
The two most common structural mistakes are reversing the object -- saying "flag Priya about the risk" instead of "flag the risk to Priya" -- and inserting an unnecessary "about" before the object, as in "flag about the delay" instead of "flag the delay."
The object is the issue, not the person
The issue is the object of flag; the person is where it gets routed, introduced by "to." Both errors come from treating flag like a verb of speaking (like "talk to someone about something") rather than the directly transitive verb it actually is.
Wrong: "I flagged my manager about the delay." Right: "I flagged the delay to my manager."
Wrong: "She flagged about a data-quality issue in the report." Right: "She flagged a data-quality issue in the report."
There's one narrow exception worth naming, so it doesn't get mistaken for a third error: "flag someone" is grammatical when the person or their account is itself the item being marked as suspicious -- a distinct, narrower use, not a substitute for "notify someone."
Exception, not an error: "The account was flagged for unusual login activity" -- here the account itself is the item being marked, which is different from "notify the account holder."
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Start learning for free →Why this keeps happening
Both errors trace back to the same instinct: borrowing the sentence shape of a verb like "tell" or "talk to," where the person comes first and the topic follows with "about." Flag doesn't work that way. Fix the object once -- issue first, person after "to" -- and both mistakes disappear together.
A quick test before you send the sentence
A fast way to check your own sentence before sending it: ask what immediately follows the word "flag." If it's a person's name, that's usually the reversed-object error, unless you're in the narrow case where the person's account is itself the flagged item. If it's the word "about," that's almost always the unnecessary preposition, and the sentence reads more naturally with "about" deleted entirely.
Both mistakes are common enough that native speakers will usually still understand the intended meaning, but they're also common enough to be one of the first things a careful editor or reviewer will quietly fix -- which makes this a high-value pattern to get right on the first pass, especially in written status updates and emails where the sentence doesn't get the benefit of a listener asking a clarifying question in real time.
Both patterns are also worth checking against the preposition guide covered separately: once "to" for the recipient and no "about" before the object are both automatic, the two most common structural mistakes with this word essentially disappear from your own writing for good.
Practice scenarios
Practice using flag in situations like:
- correcting a sentence that puts the person before the issue
- double-checking whether 'about' belongs in a flag sentence at all
- recognizing the one case where 'flag someone' is actually correct
Useful practice phrases:
- "I flagged the delay to my manager."
- "She flagged a data-quality issue in the report."
- "The account was flagged for unusual login activity."
Both of these mistakes disappear once the object rule is fixed in your head: the issue goes first, the person follows with "to."
That one adjustment covers the two most common structural errors with this word.
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