Nouns
I am going to the store.
What is I
Is this an imperative sentence: Bake the cake first.
Yes
Can we go with you?.
What is we and/or you
Is this an imperative sentence: Go outside!
Yes
She is very nice.
What is she
Is this an imperative sentence: Where did you go last night?
No, interrogative
Should he pet the dog?
What is he
Is this an imperative sentence: I need to take the test today.
No, declarative (simple present)
They are using a soft voice.
What is they