I can collapse you can collapse he can collapse we can collapse you can collapse they can collapse
Forme en V-ing
I can be collapsing you can be collapsing he can be collapsing we can be collapsing you can be collapsing they can be collapsing
Perfect
I can have collapsed you can have collapsed he can have collapsed we can have collapsed you can have collapsed they can have collapsed
Perfect en V-ing
I can have been collapsing you can have been collapsing he can have been collapsing we can have been collapsing you can have been collapsing they can have been collapsing
Négation
Forme simple
I can't collapse you can't collapse he can't collapse we can't collapse you can't collapse they can't collapse
Forme en V-ing
I can't be collapsing you can't be collapsing he can't be collapsing we can't be collapsing you can't be collapsing they can't be collapsing
Perfect
I can't have collapsed you can't have collapsed he can't have collapsed we can't have collapsed you can't have collapsed they can't have collapsed
Perfect en V-ing
I can't have been collapsing you can't have been collapsing he can't have been collapsing we can't have been collapsing you can't have been collapsing they can't have been collapsing
Forme interrogative
Forme simple
can I collapse? can you collapse? can he collapse? can we collapse? can you collapse? can they collapse?
Forme en V-ing
can I be collapsing? can you be collapsing? can he be collapsing? can we be collapsing? can you be collapsing? can they be collapsing?
Perfect
can I have collapsed? can you have collapsed? can he have collapsed? can we have collapsed? can you have collapsed? can they have collapsed?
Perfect en V-ing
can I have been collapsing? can you have been collapsing? can he have been collapsing? can we have been collapsing? can you have been collapsing? can they have been collapsing?
Forme interro-négative
Forme simple
can't I collapse? can't you collapse? can't he collapse? can't we collapse? can't you collapse? can't they collapse?
Forme en V-ing
can't I be collapsing? can't you be collapsing? can't he be collapsing? can't we be collapsing? can't you be collapsing? can't they be collapsing?
Perfect
can't I have collapsed? can't you have collapsed? can't he have collapsed? can't we have collapsed? can't you have collapsed? can't they have collapsed?
Perfect en V-ing
can't I have been collapsing? can't you have been collapsing? can't he have been collapsing? can't we have been collapsing? can't you have been collapsing? can't they have been collapsing?