could compile
Regular verb: compile - compiled- compiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could compile
you could compile
she could compile
we could compile
you could compile
they could compile 	I could be compiling
you could be compiling
she could be compiling
we could be compiling
you could be compiling
they could be compiling	I could have compiled
you could have compiled
she could have compiled
we could have compiled
you could have compiled
they could have compiled	I could have been compiling
you could have been compiling
she could have been compiling
we could have been compiling
you could have been compiling
they could have been compiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't compile
you couldn't compile
she couldn't compile
we couldn't compile
you couldn't compile
they couldn't compile 	I couldn't be compiling
you couldn't be compiling
she couldn't be compiling
we couldn't be compiling
you couldn't be compiling
they couldn't be compiling	I couldn't have compiled
you couldn't have compiled
she couldn't have compiled
we couldn't have compiled
you couldn't have compiled
they couldn't have compiled	I couldn't have been compiling
you couldn't have been compiling
she couldn't have been compiling
we couldn't have been compiling
you couldn't have been compiling
they couldn't have been compiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I compile?
could you compile?
could she compile?
could we compile?
could you compile?
could they compile? 	could I be compiling?
could you be compiling?
could she be compiling?
could we be compiling?
could you be compiling?
could they be compiling? 	could I have compiled?
could you have compiled?
could she have compiled?
could we have compiled?
could you have compiled?
could they have compiled? 	could I have been compiling?
could you have been compiling?
could she have been compiling?
could we have been compiling?
could you have been compiling?
could they have been compiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I compile?
couldn't you compile?
couldn't she compile?
couldn't we compile?
couldn't you compile?
couldn't they compile? 	couldn't I be compiling?
couldn't you be compiling?
couldn't she be compiling?
couldn't we be compiling?
couldn't you be compiling?
couldn't they be compiling? 	couldn't I have compiled?
couldn't you have compiled?
couldn't she have compiled?
couldn't we have compiled?
couldn't you have compiled?
couldn't they have compiled? 	couldn't I have been compiling?
couldn't you have been compiling?
couldn't she have been compiling?
couldn't we have been compiling?
couldn't you have been compiling?
couldn't they have been compiling?