I could pitapat you could pitapat he could pitapat we could pitapat you could pitapat they could pitapat
V-ing form
I could be pitapating you could be pitapating he could be pitapating we could be pitapating you could be pitapating they could be pitapating
Perfect
I could have pitapated you could have pitapated he 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 he 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 he 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 he 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 he 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 he 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 he pitapat? could we pitapat? could you pitapat? could they pitapat?
V-ing form
could I be pitapating? could you be pitapating? could he be pitapating? could we be pitapating? could you be pitapating? could they be pitapating?
Perfect
could I have pitapated? could you have pitapated? could he 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 he 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 he 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 he 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 he 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 he have been pitapating? couldn't we have been pitapating? couldn't you have been pitapating? couldn't they have been pitapating?