I can wait you can wait she can wait we can wait you can wait they can wait
V-ing form
I can be waiting you can be waiting she can be waiting we can be waiting you can be waiting they can be waiting
Perfect
I can have waited you can have waited she 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 she can have been waiting we can have been waiting you can have been waiting they can have been waiting
Negation
Simple form
I can't wait you can't wait she can't wait we can't wait you can't wait they can't wait
V-ing form
I can't be waiting you can't be waiting she can't be waiting we can't be waiting you can't be waiting they can't be waiting
Perfect
I can't have waited you can't have waited she can't have waited we can't have waited you can't have waited they can't have waited
V-ing perfect
I can't have been waiting you can't have been waiting she can't have been waiting we can't have been waiting you can't have been waiting they can't have been waiting
Interrogative form
Simple form
can I wait? can you wait? can she wait? can we wait? can you wait? can they wait?
V-ing form
can I be waiting? can you be waiting? can she be waiting? can we be waiting? can you be waiting? can they be waiting?
Perfect
can I have waited? can you have waited? can she 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 she have been waiting? can we have been waiting? can you have been waiting? can they have been waiting?
Interro-negative form
Simple form
can't I wait? can't you wait? can't she wait? can't we wait? can't you wait? can't they wait?
V-ing form
can't I be waiting? can't you be waiting? can't she be waiting? can't we be waiting? can't you be waiting? can't they be waiting?
Perfect
can't I have waited? can't you have waited? can't she have waited? can't we have waited? can't you have waited? can't they have waited?
V-ing perfect
can't I have been waiting? can't you have been waiting? can't she have been waiting? can't we have been waiting? can't you have been waiting? can't they have been waiting?