could assemble
Regular verb: assemble - assembled- assembled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could assemble
you could assemble
he could assemble
we could assemble
you could assemble
they could assemble 	I could be assembling
you could be assembling
he could be assembling
we could be assembling
you could be assembling
they could be assembling	I could have assembled
you could have assembled
he could have assembled
we could have assembled
you could have assembled
they could have assembled	I could have been assembling
you could have been assembling
he could have been assembling
we could have been assembling
you could have been assembling
they could have been assembling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not assemble
you could not assemble
he could not assemble
we could not assemble
you could not assemble
they could not assemble 	I could not be assembling
you could not be assembling
he could not be assembling
we could not be assembling
you could not be assembling
they could not be assembling	I could not have assembled
you could not have assembled
he could not have assembled
we could not have assembled
you could not have assembled
they could not have assembled	I could not have been assembling
you could not have been assembling
he could not have been assembling
we could not have been assembling
you could not have been assembling
they could not have been assembling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I assemble?
could you assemble?
could he assemble?
could we assemble?
could you assemble?
could they assemble? 	could I be assembling?
could you be assembling?
could he be assembling?
could we be assembling?
could you be assembling?
could they be assembling? 	could I have assembled?
could you have assembled?
could he have assembled?
could we have assembled?
could you have assembled?
could they have assembled? 	could I have been assembling?
could you have been assembling?
could he have been assembling?
could we have been assembling?
could you have been assembling?
could they have been assembling? 	

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