Question

she is very attentive in class answer plural form of verb

Answer 1

If we want to change the verb into plural form, then the noun also has to change into plural form.  So   "she" can be changed into "they" or "the girls".

    They are very attentive in class.
    The girls are very attentive in class.

"are " is the plural form of "is".

Answer 2

Answer:

The girls are very attentive in the class.

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