I can buttress you can buttress he can buttress we can buttress you can buttress they can buttress
Forme en V-ing
I can be buttressing you can be buttressing he can be buttressing we can be buttressing you can be buttressing they can be buttressing
Perfect
I can have buttressed you can have buttressed he can have buttressed we can have buttressed you can have buttressed they can have buttressed
Perfect en V-ing
I can have been buttressing you can have been buttressing he can have been buttressing we can have been buttressing you can have been buttressing they can have been buttressing
Négation
Forme simple
I can't buttress you can't buttress he can't buttress we can't buttress you can't buttress they can't buttress
Forme en V-ing
I can't be buttressing you can't be buttressing he can't be buttressing we can't be buttressing you can't be buttressing they can't be buttressing
Perfect
I can't have buttressed you can't have buttressed he can't have buttressed we can't have buttressed you can't have buttressed they can't have buttressed
Perfect en V-ing
I can't have been buttressing you can't have been buttressing he can't have been buttressing we can't have been buttressing you can't have been buttressing they can't have been buttressing
Forme interrogative
Forme simple
can I buttress? can you buttress? can he buttress? can we buttress? can you buttress? can they buttress?
Forme en V-ing
can I be buttressing? can you be buttressing? can he be buttressing? can we be buttressing? can you be buttressing? can they be buttressing?
Perfect
can I have buttressed? can you have buttressed? can he have buttressed? can we have buttressed? can you have buttressed? can they have buttressed?
Perfect en V-ing
can I have been buttressing? can you have been buttressing? can he have been buttressing? can we have been buttressing? can you have been buttressing? can they have been buttressing?
Forme interro-négative
Forme simple
can't I buttress? can't you buttress? can't he buttress? can't we buttress? can't you buttress? can't they buttress?
Forme en V-ing
can't I be buttressing? can't you be buttressing? can't he be buttressing? can't we be buttressing? can't you be buttressing? can't they be buttressing?
Perfect
can't I have buttressed? can't you have buttressed? can't he have buttressed? can't we have buttressed? can't you have buttressed? can't they have buttressed?
Perfect en V-ing
can't I have been buttressing? can't you have been buttressing? can't he have been buttressing? can't we have been buttressing? can't you have been buttressing? can't they have been buttressing?