could complete
Regular verb: complete - completed- completed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could complete
you could complete
he could complete
we could complete
you could complete
they could complete 	I could be completing
you could be completing
he could be completing
we could be completing
you could be completing
they could be completing	I could have completed
you could have completed
he could have completed
we could have completed
you could have completed
they could have completed	I could have been completing
you could have been completing
he could have been completing
we could have been completing
you could have been completing
they could have been completing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not complete
you could not complete
he could not complete
we could not complete
you could not complete
they could not complete 	I could not be completing
you could not be completing
he could not be completing
we could not be completing
you could not be completing
they could not be completing	I could not have completed
you could not have completed
he could not have completed
we could not have completed
you could not have completed
they could not have completed	I could not have been completing
you could not have been completing
he could not have been completing
we could not have been completing
you could not have been completing
they could not have been completing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I complete?
could you complete?
could he complete?
could we complete?
could you complete?
could they complete? 	could I be completing?
could you be completing?
could he be completing?
could we be completing?
could you be completing?
could they be completing? 	could I have completed?
could you have completed?
could he have completed?
could we have completed?
could you have completed?
could they have completed? 	could I have been completing?
could you have been completing?
could he have been completing?
could we have been completing?
could you have been completing?
could they have been completing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not complete?
could you not complete?
could he not complete?
could we not complete?
could you not complete?
could they not complete? 	could I not be completing?
could you not be completing?
could he not be completing?
could we not be completing?
could you not be completing?
could they not be completing? 	could I not have completed?
could you not have completed?
could he not have completed?
could we not have completed?
could you not have completed?
could they not have completed? 	could I not have been completing?
could you not have been completing?
could he not have been completing?
could we not have been completing?
could you not have been completing?
could they not have been completing?