could devise
Regular verb: devise - devised- devised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could devise
you could devise
she could devise
we could devise
you could devise
they could devise 	I could be devising
you could be devising
she could be devising
we could be devising
you could be devising
they could be devising	I could have devised
you could have devised
she could have devised
we could have devised
you could have devised
they could have devised	I could have been devising
you could have been devising
she could have been devising
we could have been devising
you could have been devising
they could have been devising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not devise
you could not devise
she could not devise
we could not devise
you could not devise
they could not devise 	I could not be devising
you could not be devising
she could not be devising
we could not be devising
you could not be devising
they could not be devising	I could not have devised
you could not have devised
she could not have devised
we could not have devised
you could not have devised
they could not have devised	I could not have been devising
you could not have been devising
she could not have been devising
we could not have been devising
you could not have been devising
they could not have been devising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I devise?
could you devise?
could she devise?
could we devise?
could you devise?
could they devise? 	could I be devising?
could you be devising?
could she be devising?
could we be devising?
could you be devising?
could they be devising? 	could I have devised?
could you have devised?
could she have devised?
could we have devised?
could you have devised?
could they have devised? 	could I have been devising?
could you have been devising?
could she have been devising?
could we have been devising?
could you have been devising?
could they have been devising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not devise?
could you not devise?
could she not devise?
could we not devise?
could you not devise?
could they not devise? 	could I not be devising?
could you not be devising?
could she not be devising?
could we not be devising?
could you not be devising?
could they not be devising? 	could I not have devised?
could you not have devised?
could she not have devised?
could we not have devised?
could you not have devised?
could they not have devised? 	could I not have been devising?
could you not have been devising?
could she not have been devising?
could we not have been devising?
could you not have been devising?
could they not have been devising?