I could contain you could contain she could contain we could contain you could contain they could contain
V-ing form
I could be containing you could be containing she could be containing we could be containing you could be containing they could be containing
Perfect
I could have contained you could have contained she could have contained we could have contained you could have contained they could have contained
V-ing perfect
I could have been containing you could have been containing she could have been containing we could have been containing you could have been containing they could have been containing
Negation
Simple form
I couldn't contain you couldn't contain she couldn't contain we couldn't contain you couldn't contain they couldn't contain
V-ing form
I couldn't be containing you couldn't be containing she couldn't be containing we couldn't be containing you couldn't be containing they couldn't be containing
Perfect
I couldn't have contained you couldn't have contained she couldn't have contained we couldn't have contained you couldn't have contained they couldn't have contained
V-ing perfect
I couldn't have been containing you couldn't have been containing she 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
could I contain? could you contain? could she contain? could we contain? could you contain? could they contain?
V-ing form
could I be containing? could you be containing? could she be containing? could we be containing? could you be containing? could they be containing?
Perfect
could I have contained? could you have contained? could she have contained? could we have contained? could you have contained? could they have contained?
V-ing perfect
could I have been containing? could you have been containing? could she have been containing? could we have been containing? could you have been containing? could they have been containing?
Interro-negative form
Simple form
couldn't I contain? couldn't you contain? couldn't she contain? couldn't we contain? couldn't you contain? couldn't they contain?
V-ing form
couldn't I be containing? couldn't you be containing? couldn't she be containing? couldn't we be containing? couldn't you be containing? couldn't they be containing?
Perfect
couldn't I have contained? couldn't you have contained? couldn't she have contained? couldn't we have contained? couldn't you have contained? couldn't they have contained?
V-ing perfect
couldn't I have been containing? couldn't you have been containing? couldn't she have been containing? couldn't we have been containing? couldn't you have been containing? couldn't they have been containing?