I can contrast you can contrast he can contrast we can contrast you can contrast they can contrast
V-ing form
I can be contrasting you can be contrasting he can be contrasting we can be contrasting you can be contrasting they can be contrasting
Perfect
I can have contrasted you can have contrasted he can have contrasted we can have contrasted you can have contrasted they can have contrasted
V-ing perfect
I can have been contrasting you can have been contrasting he can have been contrasting we can have been contrasting you can have been contrasting they can have been contrasting
Negation
Simple form
I cannot contrast you cannot contrast he cannot contrast we cannot contrast you cannot contrast they cannot contrast
V-ing form
I cannot be contrasting you cannot be contrasting he cannot be contrasting we cannot be contrasting you cannot be contrasting they cannot be contrasting
Perfect
I cannot have contrasted you cannot have contrasted he cannot have contrasted we cannot have contrasted you cannot have contrasted they cannot have contrasted
V-ing perfect
I cannot have been contrasting you cannot have been contrasting he cannot have been contrasting we cannot have been contrasting you cannot have been contrasting they cannot have been contrasting
Interrogative form
Simple form
can I contrast? can you contrast? can he contrast? can we contrast? can you contrast? can they contrast?
V-ing form
can I be contrasting? can you be contrasting? can he be contrasting? can we be contrasting? can you be contrasting? can they be contrasting?
Perfect
can I have contrasted? can you have contrasted? can he have contrasted? can we have contrasted? can you have contrasted? can they have contrasted?
V-ing perfect
can I have been contrasting? can you have been contrasting? can he have been contrasting? can we have been contrasting? can you have been contrasting? can they have been contrasting?
Interro-negative form
Simple form
can I not contrast? can you not contrast? can he not contrast? can we not contrast? can you not contrast? can they not contrast?
V-ing form
can I not be contrasting? can you not be contrasting? can he not be contrasting? can we not be contrasting? can you not be contrasting? can they not be contrasting?
Perfect
can I not have contrasted? can you not have contrasted? can he not have contrasted? can we not have contrasted? can you not have contrasted? can they not have contrasted?
V-ing perfect
can I not have been contrasting? can you not have been contrasting? can he not have been contrasting? can we not have been contrasting? can you not have been contrasting? can they not have been contrasting?