could simplify
Regular verb: simplify - simplified- simplified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could simplify
you could simplify
she could simplify
we could simplify
you could simplify
they could simplify 	I could be simplifying
you could be simplifying
she could be simplifying
we could be simplifying
you could be simplifying
they could be simplifying	I could have simplified
you could have simplified
she could have simplified
we could have simplified
you could have simplified
they could have simplified	I could have been simplifying
you could have been simplifying
she could have been simplifying
we could have been simplifying
you could have been simplifying
they could have been simplifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't simplify
you couldn't simplify
she couldn't simplify
we couldn't simplify
you couldn't simplify
they couldn't simplify 	I couldn't be simplifying
you couldn't be simplifying
she couldn't be simplifying
we couldn't be simplifying
you couldn't be simplifying
they couldn't be simplifying	I couldn't have simplified
you couldn't have simplified
she couldn't have simplified
we couldn't have simplified
you couldn't have simplified
they couldn't have simplified	I couldn't have been simplifying
you couldn't have been simplifying
she couldn't have been simplifying
we couldn't have been simplifying
you couldn't have been simplifying
they couldn't have been simplifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I simplify?
could you simplify?
could she simplify?
could we simplify?
could you simplify?
could they simplify? 	could I be simplifying?
could you be simplifying?
could she be simplifying?
could we be simplifying?
could you be simplifying?
could they be simplifying? 	could I have simplified?
could you have simplified?
could she have simplified?
could we have simplified?
could you have simplified?
could they have simplified? 	could I have been simplifying?
could you have been simplifying?
could she have been simplifying?
could we have been simplifying?
could you have been simplifying?
could they have been simplifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I simplify?
couldn't you simplify?
couldn't she simplify?
couldn't we simplify?
couldn't you simplify?
couldn't they simplify? 	couldn't I be simplifying?
couldn't you be simplifying?
couldn't she be simplifying?
couldn't we be simplifying?
couldn't you be simplifying?
couldn't they be simplifying? 	couldn't I have simplified?
couldn't you have simplified?
couldn't she have simplified?
couldn't we have simplified?
couldn't you have simplified?
couldn't they have simplified? 	couldn't I have been simplifying?
couldn't you have been simplifying?
couldn't she have been simplifying?
couldn't we have been simplifying?
couldn't you have been simplifying?
couldn't they have been simplifying?