could compute
Regular verb: compute - computed- computed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could compute
you could compute
she could compute
we could compute
you could compute
they could compute 	I could be computing
you could be computing
she could be computing
we could be computing
you could be computing
they could be computing	I could have computed
you could have computed
she could have computed
we could have computed
you could have computed
they could have computed	I could have been computing
you could have been computing
she could have been computing
we could have been computing
you could have been computing
they could have been computing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not compute
you could not compute
she could not compute
we could not compute
you could not compute
they could not compute 	I could not be computing
you could not be computing
she could not be computing
we could not be computing
you could not be computing
they could not be computing	I could not have computed
you could not have computed
she could not have computed
we could not have computed
you could not have computed
they could not have computed	I could not have been computing
you could not have been computing
she could not have been computing
we could not have been computing
you could not have been computing
they could not have been computing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I compute?
could you compute?
could she compute?
could we compute?
could you compute?
could they compute? 	could I be computing?
could you be computing?
could she be computing?
could we be computing?
could you be computing?
could they be computing? 	could I have computed?
could you have computed?
could she have computed?
could we have computed?
could you have computed?
could they have computed? 	could I have been computing?
could you have been computing?
could she have been computing?
could we have been computing?
could you have been computing?
could they have been computing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not compute?
could you not compute?
could she not compute?
could we not compute?
could you not compute?
could they not compute? 	could I not be computing?
could you not be computing?
could she not be computing?
could we not be computing?
could you not be computing?
could they not be computing? 	could I not have computed?
could you not have computed?
could she not have computed?
could we not have computed?
could you not have computed?
could they not have computed? 	could I not have been computing?
could you not have been computing?
could she not have been computing?
could we not have been computing?
could you not have been computing?
could they not have been computing?