I can alternate you can alternate she can alternate we can alternate you can alternate they can alternate
V-ing form
I can be alternating you can be alternating she can be alternating we can be alternating you can be alternating they can be alternating
Perfect
I can have alternated you can have alternated she can have alternated we can have alternated you can have alternated they can have alternated
V-ing perfect
I can have been alternating you can have been alternating she can have been alternating we can have been alternating you can have been alternating they can have been alternating
Negation
Simple form
I cannot alternate you cannot alternate she cannot alternate we cannot alternate you cannot alternate they cannot alternate
V-ing form
I cannot be alternating you cannot be alternating she cannot be alternating we cannot be alternating you cannot be alternating they cannot be alternating
Perfect
I cannot have alternated you cannot have alternated she cannot have alternated we cannot have alternated you cannot have alternated they cannot have alternated
V-ing perfect
I cannot have been alternating you cannot have been alternating she cannot have been alternating we cannot have been alternating you cannot have been alternating they cannot have been alternating
Interrogative form
Simple form
can I alternate? can you alternate? can she alternate? can we alternate? can you alternate? can they alternate?
V-ing form
can I be alternating? can you be alternating? can she be alternating? can we be alternating? can you be alternating? can they be alternating?
Perfect
can I have alternated? can you have alternated? can she have alternated? can we have alternated? can you have alternated? can they have alternated?
V-ing perfect
can I have been alternating? can you have been alternating? can she have been alternating? can we have been alternating? can you have been alternating? can they have been alternating?
Interro-negative form
Simple form
can I not alternate? can you not alternate? can she not alternate? can we not alternate? can you not alternate? can they not alternate?
V-ing form
can I not be alternating? can you not be alternating? can she not be alternating? can we not be alternating? can you not be alternating? can they not be alternating?
Perfect
can I not have alternated? can you not have alternated? can she not have alternated? can we not have alternated? can you not have alternated? can they not have alternated?
V-ing perfect
can I not have been alternating? can you not have been alternating? can she not have been alternating? can we not have been alternating? can you not have been alternating? can they not have been alternating?