False Positives: The form of the verb must agree in grammatical number with the pronoun

**What got flagged?**
>She motioned to the glass.

>When had he become such a curmudgeon?

>She spun around on her stool as he tried to piece together a response.

**Why is this incorrect?**
These three sentences are grammatically correct.
These three sentences produce the `PronounVerbAgreemet` error.

The first, highlighting _motioned_, offers no suggested solution. It's unclear what it finds wrong here. It is similar to the third, which highlights _spun_. Both of these sentences refer to a singular _she_, but appear to think motioned and spun are either plural and shouldn't be, or need to be? Is it struggling with the past-tense forms of these words?

The second highlights _become_, offering the quick fix of _become**s**_ which is a puzzling suggestion and unquestionably wrong.

Start by reproducing the three reported sentences and inspecting the PronounVerbAgreemet diagnostic and suggested fixes. Trace the rule that handles past-tense verbs and modal or auxiliary constructions; done means these grammatical sentences produce no false positives or incorrect corrections, with regression coverage for the examples.

Written by the indexing model from the issue text.