could placard
Regular verb: placard - placarded- placarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could placard
you could placard
she could placard
we could placard
you could placard
they could placard 	I could be placarding
you could be placarding
she could be placarding
we could be placarding
you could be placarding
they could be placarding	I could have placarded
you could have placarded
she could have placarded
we could have placarded
you could have placarded
they could have placarded	I could have been placarding
you could have been placarding
she could have been placarding
we could have been placarding
you could have been placarding
they could have been placarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not placard
you could not placard
she could not placard
we could not placard
you could not placard
they could not placard 	I could not be placarding
you could not be placarding
she could not be placarding
we could not be placarding
you could not be placarding
they could not be placarding	I could not have placarded
you could not have placarded
she could not have placarded
we could not have placarded
you could not have placarded
they could not have placarded	I could not have been placarding
you could not have been placarding
she could not have been placarding
we could not have been placarding
you could not have been placarding
they could not have been placarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I placard?
could you placard?
could she placard?
could we placard?
could you placard?
could they placard? 	could I be placarding?
could you be placarding?
could she be placarding?
could we be placarding?
could you be placarding?
could they be placarding? 	could I have placarded?
could you have placarded?
could she have placarded?
could we have placarded?
could you have placarded?
could they have placarded? 	could I have been placarding?
could you have been placarding?
could she have been placarding?
could we have been placarding?
could you have been placarding?
could they have been placarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not placard?
could you not placard?
could she not placard?
could we not placard?
could you not placard?
could they not placard? 	could I not be placarding?
could you not be placarding?
could she not be placarding?
could we not be placarding?
could you not be placarding?
could they not be placarding? 	could I not have placarded?
could you not have placarded?
could she not have placarded?
could we not have placarded?
could you not have placarded?
could they not have placarded? 	could I not have been placarding?
could you not have been placarding?
could she not have been placarding?
could we not have been placarding?
could you not have been placarding?
could they not have been placarding?