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