I can ump you can ump he can ump we can ump you can ump they can ump
V-ing form
I can be umping you can be umping he can be umping we can be umping you can be umping they can be umping
Perfect
I can have umped you can have umped he can have umped we can have umped you can have umped they can have umped
V-ing perfect
I can have been umping you can have been umping he can have been umping we can have been umping you can have been umping they can have been umping
Negation
Simple form
I cannot ump you cannot ump he cannot ump we cannot ump you cannot ump they cannot ump
V-ing form
I cannot be umping you cannot be umping he cannot be umping we cannot be umping you cannot be umping they cannot be umping
Perfect
I cannot have umped you cannot have umped he cannot have umped we cannot have umped you cannot have umped they cannot have umped
V-ing perfect
I cannot have been umping you cannot have been umping he cannot have been umping we cannot have been umping you cannot have been umping they cannot have been umping
Interrogative form
Simple form
can I ump? can you ump? can he ump? can we ump? can you ump? can they ump?
V-ing form
can I be umping? can you be umping? can he be umping? can we be umping? can you be umping? can they be umping?
Perfect
can I have umped? can you have umped? can he have umped? can we have umped? can you have umped? can they have umped?
V-ing perfect
can I have been umping? can you have been umping? can he have been umping? can we have been umping? can you have been umping? can they have been umping?
Interro-negative form
Simple form
can I not ump? can you not ump? can he not ump? can we not ump? can you not ump? can they not ump?
V-ing form
can I not be umping? can you not be umping? can he not be umping? can we not be umping? can you not be umping? can they not be umping?
Perfect
can I not have umped? can you not have umped? can he not have umped? can we not have umped? can you not have umped? can they not have umped?
V-ing perfect
can I not have been umping? can you not have been umping? can he not have been umping? can we not have been umping? can you not have been umping? can they not have been umping?