I can wait you can wait he can wait we can wait you can wait they can wait
V-ing form
I can be waiting you can be waiting he can be waiting we can be waiting you can be waiting they can be waiting
Perfect
I can have waited you can have waited he can have waited we can have waited you can have waited they can have waited
V-ing perfect
I can have been waiting you can have been waiting he can have been waiting we can have been waiting you can have been waiting they can have been waiting
Negation
Simple form
I cannot wait you cannot wait he cannot wait we cannot wait you cannot wait they cannot wait
V-ing form
I cannot be waiting you cannot be waiting he cannot be waiting we cannot be waiting you cannot be waiting they cannot be waiting
Perfect
I cannot have waited you cannot have waited he cannot have waited we cannot have waited you cannot have waited they cannot have waited
V-ing perfect
I cannot have been waiting you cannot have been waiting he cannot have been waiting we cannot have been waiting you cannot have been waiting they cannot have been waiting
Interrogative form
Simple form
can I wait? can you wait? can he wait? can we wait? can you wait? can they wait?
V-ing form
can I be waiting? can you be waiting? can he be waiting? can we be waiting? can you be waiting? can they be waiting?
Perfect
can I have waited? can you have waited? can he have waited? can we have waited? can you have waited? can they have waited?
V-ing perfect
can I have been waiting? can you have been waiting? can he have been waiting? can we have been waiting? can you have been waiting? can they have been waiting?
Interro-negative form
Simple form
can I not wait? can you not wait? can he not wait? can we not wait? can you not wait? can they not wait?
V-ing form
can I not be waiting? can you not be waiting? can he not be waiting? can we not be waiting? can you not be waiting? can they not be waiting?
Perfect
can I not have waited? can you not have waited? can he not have waited? can we not have waited? can you not have waited? can they not have waited?
V-ing perfect
can I not have been waiting? can you not have been waiting? can he not have been waiting? can we not have been waiting? can you not have been waiting? can they not have been waiting?