English verb conjugation
COULD BLOCK

Regular verb: block - blocked - blocked

Affirmation

Simple form	V-ing form
I could block you could block he could block we could block you could block they could block	I could be blocking you could be blocking he could be blocking we could be blocking you could be blocking they could be blocking
Perfect	V-ing perfect
I could have blocked you could have blocked he could have blocked we could have blocked you could have blocked they could have blocked	I could have been blocking you could have been blocking he could have been blocking we could have been blocking you could have been blocking they could have been blocking

Negation

Simple form	V-ing form
I couldn't block you couldn't block he couldn't block we couldn't block you couldn't block they couldn't block	I couldn't be blocking you couldn't be blocking he couldn't be blocking we couldn't be blocking you couldn't be blocking they couldn't be blocking
Perfect	V-ing perfect
I couldn't have blocked you couldn't have blocked he couldn't have blocked we couldn't have blocked you couldn't have blocked they couldn't have blocked	I couldn't have been blocking you couldn't have been blocking he couldn't have been blocking we couldn't have been blocking you couldn't have been blocking they couldn't have been blocking

Interrogative form

Simple form	V-ing form
could I block? could you block? could he block? could we block? could you block? could they block?	could I be blocking? could you be blocking? could he be blocking? could we be blocking? could you be blocking? could they be blocking?
Perfect	V-ing perfect
could I have blocked? could you have blocked? could he have blocked? could we have blocked? could you have blocked? could they have blocked?	could I have been blocking? could you have been blocking? could he have been blocking? could we have been blocking? could you have been blocking? could they have been blocking?

Interro-negative form

Simple form	V-ing form
couldn't I block? couldn't you block? couldn't he block? couldn't we block? couldn't you block? couldn't they block?	couldn't I be blocking? couldn't you be blocking? couldn't he be blocking? couldn't we be blocking? couldn't you be blocking? couldn't they be blocking?
Perfect	V-ing perfect
couldn't I have blocked? couldn't you have blocked? couldn't he have blocked? couldn't we have blocked? couldn't you have blocked? couldn't they have blocked?	couldn't I have been blocking? couldn't you have been blocking? couldn't he have been blocking? couldn't we have been blocking? couldn't you have been blocking? couldn't they have been blocking?