could prettify
Regular verb: prettify - prettified- prettified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prettify
you could prettify
she could prettify
we could prettify
you could prettify
they could prettify 	I could be prettifying
you could be prettifying
she could be prettifying
we could be prettifying
you could be prettifying
they could be prettifying	I could have prettified
you could have prettified
she could have prettified
we could have prettified
you could have prettified
they could have prettified	I could have been prettifying
you could have been prettifying
she could have been prettifying
we could have been prettifying
you could have been prettifying
they could have been prettifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not prettify
you could not prettify
she could not prettify
we could not prettify
you could not prettify
they could not prettify 	I could not be prettifying
you could not be prettifying
she could not be prettifying
we could not be prettifying
you could not be prettifying
they could not be prettifying	I could not have prettified
you could not have prettified
she could not have prettified
we could not have prettified
you could not have prettified
they could not have prettified	I could not have been prettifying
you could not have been prettifying
she could not have been prettifying
we could not have been prettifying
you could not have been prettifying
they could not have been prettifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prettify?
could you prettify?
could she prettify?
could we prettify?
could you prettify?
could they prettify? 	could I be prettifying?
could you be prettifying?
could she be prettifying?
could we be prettifying?
could you be prettifying?
could they be prettifying? 	could I have prettified?
could you have prettified?
could she have prettified?
could we have prettified?
could you have prettified?
could they have prettified? 	could I have been prettifying?
could you have been prettifying?
could she have been prettifying?
could we have been prettifying?
could you have been prettifying?
could they have been prettifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not prettify?
could you not prettify?
could she not prettify?
could we not prettify?
could you not prettify?
could they not prettify? 	could I not be prettifying?
could you not be prettifying?
could she not be prettifying?
could we not be prettifying?
could you not be prettifying?
could they not be prettifying? 	could I not have prettified?
could you not have prettified?
could she not have prettified?
could we not have prettified?
could you not have prettified?
could they not have prettified? 	could I not have been prettifying?
could you not have been prettifying?
could she not have been prettifying?
could we not have been prettifying?
could you not have been prettifying?
could they not have been prettifying?