English verb conjugation
CAN BUTTRESS

Regular verb: buttress - buttressed - buttressed

Affirmation

Simple form	V-ing form
I can buttress you can buttress she can buttress we can buttress you can buttress they can buttress	I can be buttressing you can be buttressing she can be buttressing we can be buttressing you can be buttressing they can be buttressing
Perfect	V-ing perfect
I can have buttressed you can have buttressed she can have buttressed we can have buttressed you can have buttressed they can have buttressed	I can have been buttressing you can have been buttressing she can have been buttressing we can have been buttressing you can have been buttressing they can have been buttressing

Negation

Simple form	V-ing form
I cannot buttress you cannot buttress she cannot buttress we cannot buttress you cannot buttress they cannot buttress	I cannot be buttressing you cannot be buttressing she cannot be buttressing we cannot be buttressing you cannot be buttressing they cannot be buttressing
Perfect	V-ing perfect
I cannot have buttressed you cannot have buttressed she cannot have buttressed we cannot have buttressed you cannot have buttressed they cannot have buttressed	I cannot have been buttressing you cannot have been buttressing she cannot have been buttressing we cannot have been buttressing you cannot have been buttressing they cannot have been buttressing

Interrogative form

Simple form	V-ing form
can I buttress? can you buttress? can she buttress? can we buttress? can you buttress? can they buttress?	can I be buttressing? can you be buttressing? can she be buttressing? can we be buttressing? can you be buttressing? can they be buttressing?
Perfect	V-ing perfect
can I have buttressed? can you have buttressed? can she have buttressed? can we have buttressed? can you have buttressed? can they have buttressed?	can I have been buttressing? can you have been buttressing? can she have been buttressing? can we have been buttressing? can you have been buttressing? can they have been buttressing?

Interro-negative form

Simple form	V-ing form
can I not buttress? can you not buttress? can she not buttress? can we not buttress? can you not buttress? can they not buttress?	can I not be buttressing? can you not be buttressing? can she not be buttressing? can we not be buttressing? can you not be buttressing? can they not be buttressing?
Perfect	V-ing perfect
can I not have buttressed? can you not have buttressed? can she not have buttressed? can we not have buttressed? can you not have buttressed? can they not have buttressed?	can I not have been buttressing? can you not have been buttressing? can she not have been buttressing? can we not have been buttressing? can you not have been buttressing? can they not have been buttressing?