I can alternate you can alternate he can alternate we can alternate you can alternate they can alternate
V-ing form
I can be alternating you can be alternating he can be alternating we can be alternating you can be alternating they can be alternating
Perfect
I can have alternated you can have alternated he 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 he can have been alternating we can have been alternating you can have been alternating they can have been alternating
Negation
Simple form
I can't alternate you can't alternate he can't alternate we can't alternate you can't alternate they can't alternate
V-ing form
I can't be alternating you can't be alternating he can't be alternating we can't be alternating you can't be alternating they can't be alternating
Perfect
I can't have alternated you can't have alternated he can't have alternated we can't have alternated you can't have alternated they can't have alternated
V-ing perfect
I can't have been alternating you can't have been alternating he can't have been alternating we can't have been alternating you can't have been alternating they can't have been alternating
Interrogative form
Simple form
can I alternate? can you alternate? can he alternate? can we alternate? can you alternate? can they alternate?
V-ing form
can I be alternating? can you be alternating? can he be alternating? can we be alternating? can you be alternating? can they be alternating?
Perfect
can I have alternated? can you have alternated? can he 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 he have been alternating? can we have been alternating? can you have been alternating? can they have been alternating?
Interro-negative form
Simple form
can't I alternate? can't you alternate? can't he alternate? can't we alternate? can't you alternate? can't they alternate?
V-ing form
can't I be alternating? can't you be alternating? can't he be alternating? can't we be alternating? can't you be alternating? can't they be alternating?
Perfect
can't I have alternated? can't you have alternated? can't he have alternated? can't we have alternated? can't you have alternated? can't they have alternated?
V-ing perfect
can't I have been alternating? can't you have been alternating? can't he have been alternating? can't we have been alternating? can't you have been alternating? can't they have been alternating?