I can contrast you can contrast she can contrast we can contrast you can contrast they can contrast
V-ing form
I can be contrasting you can be contrasting she can be contrasting we can be contrasting you can be contrasting they can be contrasting
Perfect
I can have contrasted you can have contrasted she 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 she 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 she cannot contrast we cannot contrast you cannot contrast they cannot contrast
V-ing form
I cannot be contrasting you cannot be contrasting she cannot be contrasting we cannot be contrasting you cannot be contrasting they cannot be contrasting
Perfect
I cannot have contrasted you cannot have contrasted she 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 she 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 she contrast? can we contrast? can you contrast? can they contrast?
V-ing form
can I be contrasting? can you be contrasting? can she be contrasting? can we be contrasting? can you be contrasting? can they be contrasting?
Perfect
can I have contrasted? can you have contrasted? can she 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 she 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 she 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 she 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 she 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 she not have been contrasting? can we not have been contrasting? can you not have been contrasting? can they not have been contrasting?