could cement
Regular verb: cement - cemented- cemented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cement
you could cement
she could cement
we could cement
you could cement
they could cement 	I could be cementing
you could be cementing
she could be cementing
we could be cementing
you could be cementing
they could be cementing	I could have cemented
you could have cemented
she could have cemented
we could have cemented
you could have cemented
they could have cemented	I could have been cementing
you could have been cementing
she could have been cementing
we could have been cementing
you could have been cementing
they could have been cementing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cement
you couldn't cement
she couldn't cement
we couldn't cement
you couldn't cement
they couldn't cement 	I couldn't be cementing
you couldn't be cementing
she couldn't be cementing
we couldn't be cementing
you couldn't be cementing
they couldn't be cementing	I couldn't have cemented
you couldn't have cemented
she couldn't have cemented
we couldn't have cemented
you couldn't have cemented
they couldn't have cemented	I couldn't have been cementing
you couldn't have been cementing
she couldn't have been cementing
we couldn't have been cementing
you couldn't have been cementing
they couldn't have been cementing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cement?
could you cement?
could she cement?
could we cement?
could you cement?
could they cement? 	could I be cementing?
could you be cementing?
could she be cementing?
could we be cementing?
could you be cementing?
could they be cementing? 	could I have cemented?
could you have cemented?
could she have cemented?
could we have cemented?
could you have cemented?
could they have cemented? 	could I have been cementing?
could you have been cementing?
could she have been cementing?
could we have been cementing?
could you have been cementing?
could they have been cementing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cement?
couldn't you cement?
couldn't she cement?
couldn't we cement?
couldn't you cement?
couldn't they cement? 	couldn't I be cementing?
couldn't you be cementing?
couldn't she be cementing?
couldn't we be cementing?
couldn't you be cementing?
couldn't they be cementing? 	couldn't I have cemented?
couldn't you have cemented?
couldn't she have cemented?
couldn't we have cemented?
couldn't you have cemented?
couldn't they have cemented? 	couldn't I have been cementing?
couldn't you have been cementing?
couldn't she have been cementing?
couldn't we have been cementing?
couldn't you have been cementing?
couldn't they have been cementing?