I could imitate you could imitate she could imitate we could imitate you could imitate they could imitate
V-ing form
I could be imitating you could be imitating she could be imitating we could be imitating you could be imitating they could be imitating
Perfect
I could have imitated you could have imitated she could have imitated we could have imitated you could have imitated they could have imitated
V-ing perfect
I could have been imitating you could have been imitating she could have been imitating we could have been imitating you could have been imitating they could have been imitating
Negation
Simple form
I could not imitate you could not imitate she could not imitate we could not imitate you could not imitate they could not imitate
V-ing form
I could not be imitating you could not be imitating she could not be imitating we could not be imitating you could not be imitating they could not be imitating
Perfect
I could not have imitated you could not have imitated she could not have imitated we could not have imitated you could not have imitated they could not have imitated
V-ing perfect
I could not have been imitating you could not have been imitating she could not have been imitating we could not have been imitating you could not have been imitating they could not have been imitating
Interrogative form
Simple form
could I imitate? could you imitate? could she imitate? could we imitate? could you imitate? could they imitate?
V-ing form
could I be imitating? could you be imitating? could she be imitating? could we be imitating? could you be imitating? could they be imitating?
Perfect
could I have imitated? could you have imitated? could she have imitated? could we have imitated? could you have imitated? could they have imitated?
V-ing perfect
could I have been imitating? could you have been imitating? could she have been imitating? could we have been imitating? could you have been imitating? could they have been imitating?
Interro-negative form
Simple form
could I not imitate? could you not imitate? could she not imitate? could we not imitate? could you not imitate? could they not imitate?
V-ing form
could I not be imitating? could you not be imitating? could she not be imitating? could we not be imitating? could you not be imitating? could they not be imitating?
Perfect
could I not have imitated? could you not have imitated? could she not have imitated? could we not have imitated? could you not have imitated? could they not have imitated?
V-ing perfect
could I not have been imitating? could you not have been imitating? could she not have been imitating? could we not have been imitating? could you not have been imitating? could they not have been imitating?