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