I can assemble you can assemble he can assemble we can assemble you can assemble they can assemble
V-ing form
I can be assembling you can be assembling he can be assembling we can be assembling you can be assembling they can be assembling
Perfect
I can have assembled you can have assembled he can have assembled we can have assembled you can have assembled they can have assembled
V-ing perfect
I can have been assembling you can have been assembling he can have been assembling we can have been assembling you can have been assembling they can have been assembling
Negation
Simple form
I cannot assemble you cannot assemble he cannot assemble we cannot assemble you cannot assemble they cannot assemble
V-ing form
I cannot be assembling you cannot be assembling he cannot be assembling we cannot be assembling you cannot be assembling they cannot be assembling
Perfect
I cannot have assembled you cannot have assembled he cannot have assembled we cannot have assembled you cannot have assembled they cannot have assembled
V-ing perfect
I cannot have been assembling you cannot have been assembling he cannot have been assembling we cannot have been assembling you cannot have been assembling they cannot have been assembling
Interrogative form
Simple form
can I assemble? can you assemble? can he assemble? can we assemble? can you assemble? can they assemble?
V-ing form
can I be assembling? can you be assembling? can he be assembling? can we be assembling? can you be assembling? can they be assembling?
Perfect
can I have assembled? can you have assembled? can he have assembled? can we have assembled? can you have assembled? can they have assembled?
V-ing perfect
can I have been assembling? can you have been assembling? can he have been assembling? can we have been assembling? can you have been assembling? can they have been assembling?
Interro-negative form
Simple form
can I not assemble? can you not assemble? can he not assemble? can we not assemble? can you not assemble? can they not assemble?
V-ing form
can I not be assembling? can you not be assembling? can he not be assembling? can we not be assembling? can you not be assembling? can they not be assembling?
Perfect
can I not have assembled? can you not have assembled? can he not have assembled? can we not have assembled? can you not have assembled? can they not have assembled?
V-ing perfect
can I not have been assembling? can you not have been assembling? can he not have been assembling? can we not have been assembling? can you not have been assembling? can they not have been assembling?