I could pitapat you could pitapat she could pitapat we could pitapat you could pitapat they could pitapat
V-ing form
I could be pitapating you could be pitapating she could be pitapating we could be pitapating you could be pitapating they could be pitapating
Perfect
I could have pitapated you could have pitapated she could have pitapated we could have pitapated you could have pitapated they could have pitapated
V-ing perfect
I could have been pitapating you could have been pitapating she could have been pitapating we could have been pitapating you could have been pitapating they could have been pitapating
Negation
Simple form
I couldn't pitapat you couldn't pitapat she couldn't pitapat we couldn't pitapat you couldn't pitapat they couldn't pitapat
V-ing form
I couldn't be pitapating you couldn't be pitapating she couldn't be pitapating we couldn't be pitapating you couldn't be pitapating they couldn't be pitapating
Perfect
I couldn't have pitapated you couldn't have pitapated she couldn't have pitapated we couldn't have pitapated you couldn't have pitapated they couldn't have pitapated
V-ing perfect
I couldn't have been pitapating you couldn't have been pitapating she couldn't have been pitapating we couldn't have been pitapating you couldn't have been pitapating they couldn't have been pitapating
Interrogative form
Simple form
could I pitapat? could you pitapat? could she pitapat? could we pitapat? could you pitapat? could they pitapat?
V-ing form
could I be pitapating? could you be pitapating? could she be pitapating? could we be pitapating? could you be pitapating? could they be pitapating?
Perfect
could I have pitapated? could you have pitapated? could she have pitapated? could we have pitapated? could you have pitapated? could they have pitapated?
V-ing perfect
could I have been pitapating? could you have been pitapating? could she have been pitapating? could we have been pitapating? could you have been pitapating? could they have been pitapating?
Interro-negative form
Simple form
couldn't I pitapat? couldn't you pitapat? couldn't she pitapat? couldn't we pitapat? couldn't you pitapat? couldn't they pitapat?
V-ing form
couldn't I be pitapating? couldn't you be pitapating? couldn't she be pitapating? couldn't we be pitapating? couldn't you be pitapating? couldn't they be pitapating?
Perfect
couldn't I have pitapated? couldn't you have pitapated? couldn't she have pitapated? couldn't we have pitapated? couldn't you have pitapated? couldn't they have pitapated?
V-ing perfect
couldn't I have been pitapating? couldn't you have been pitapating? couldn't she have been pitapating? couldn't we have been pitapating? couldn't you have been pitapating? couldn't they have been pitapating?