English verb conjugation
COULD CONTAIN

Regular verb: contain - contained - contained

Affirmation

Simple form	V-ing form
I could contain you could contain he could contain we could contain you could contain they could contain	I could be containing you could be containing he could be containing we could be containing you could be containing they could be containing
Perfect	V-ing perfect
I could have contained you could have contained he could have contained we could have contained you could have contained they could have contained	I could have been containing you could have been containing he could have been containing we could have been containing you could have been containing they could have been containing

Negation

Simple form	V-ing form
I couldn't contain you couldn't contain he couldn't contain we couldn't contain you couldn't contain they couldn't contain	I couldn't be containing you couldn't be containing he couldn't be containing we couldn't be containing you couldn't be containing they couldn't be containing
Perfect	V-ing perfect
I couldn't have contained you couldn't have contained he couldn't have contained we couldn't have contained you couldn't have contained they couldn't have contained	I couldn't have been containing you couldn't have been containing he couldn't have been containing we couldn't have been containing you couldn't have been containing they couldn't have been containing

Interrogative form

Simple form	V-ing form
could I contain? could you contain? could he contain? could we contain? could you contain? could they contain?	could I be containing? could you be containing? could he be containing? could we be containing? could you be containing? could they be containing?
Perfect	V-ing perfect
could I have contained? could you have contained? could he have contained? could we have contained? could you have contained? could they have contained?	could I have been containing? could you have been containing? could he have been containing? could we have been containing? could you have been containing? could they have been containing?

Interro-negative form

Simple form	V-ing form
couldn't I contain? couldn't you contain? couldn't he contain? couldn't we contain? couldn't you contain? couldn't they contain?	couldn't I be containing? couldn't you be containing? couldn't he be containing? couldn't we be containing? couldn't you be containing? couldn't they be containing?
Perfect	V-ing perfect
couldn't I have contained? couldn't you have contained? couldn't he have contained? couldn't we have contained? couldn't you have contained? couldn't they have contained?	couldn't I have been containing? couldn't you have been containing? couldn't he have been containing? couldn't we have been containing? couldn't you have been containing? couldn't they have been containing?