I could indent you could indent he could indent we could indent you could indent they could indent
V-ing form
I could be indenting you could be indenting he could be indenting we could be indenting you could be indenting they could be indenting
Perfect
I could have indented you could have indented he could have indented we could have indented you could have indented they could have indented
V-ing perfect
I could have been indenting you could have been indenting he could have been indenting we could have been indenting you could have been indenting they could have been indenting
Negation
Simple form
I couldn't indent you couldn't indent he couldn't indent we couldn't indent you couldn't indent they couldn't indent
V-ing form
I couldn't be indenting you couldn't be indenting he couldn't be indenting we couldn't be indenting you couldn't be indenting they couldn't be indenting
Perfect
I couldn't have indented you couldn't have indented he couldn't have indented we couldn't have indented you couldn't have indented they couldn't have indented
V-ing perfect
I couldn't have been indenting you couldn't have been indenting he couldn't have been indenting we couldn't have been indenting you couldn't have been indenting they couldn't have been indenting
Interrogative form
Simple form
could I indent? could you indent? could he indent? could we indent? could you indent? could they indent?
V-ing form
could I be indenting? could you be indenting? could he be indenting? could we be indenting? could you be indenting? could they be indenting?
Perfect
could I have indented? could you have indented? could he have indented? could we have indented? could you have indented? could they have indented?
V-ing perfect
could I have been indenting? could you have been indenting? could he have been indenting? could we have been indenting? could you have been indenting? could they have been indenting?
Interro-negative form
Simple form
couldn't I indent? couldn't you indent? couldn't he indent? couldn't we indent? couldn't you indent? couldn't they indent?
V-ing form
couldn't I be indenting? couldn't you be indenting? couldn't he be indenting? couldn't we be indenting? couldn't you be indenting? couldn't they be indenting?
Perfect
couldn't I have indented? couldn't you have indented? couldn't he have indented? couldn't we have indented? couldn't you have indented? couldn't they have indented?
V-ing perfect
couldn't I have been indenting? couldn't you have been indenting? couldn't he have been indenting? couldn't we have been indenting? couldn't you have been indenting? couldn't they have been indenting?