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