could plague
Regular verb: plague - plagued- plagued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could plague
you could plague
she could plague
we could plague
you could plague
they could plague 	I could be plaguing
you could be plaguing
she could be plaguing
we could be plaguing
you could be plaguing
they could be plaguing	I could have plagued
you could have plagued
she could have plagued
we could have plagued
you could have plagued
they could have plagued	I could have been plaguing
you could have been plaguing
she could have been plaguing
we could have been plaguing
you could have been plaguing
they could have been plaguing	

Negation 	
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I could not plague
you could not plague
she could not plague
we could not plague
you could not plague
they could not plague 	I could not be plaguing
you could not be plaguing
she could not be plaguing
we could not be plaguing
you could not be plaguing
they could not be plaguing	I could not have plagued
you could not have plagued
she could not have plagued
we could not have plagued
you could not have plagued
they could not have plagued	I could not have been plaguing
you could not have been plaguing
she could not have been plaguing
we could not have been plaguing
you could not have been plaguing
they could not have been plaguing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I plague?
could you plague?
could she plague?
could we plague?
could you plague?
could they plague? 	could I be plaguing?
could you be plaguing?
could she be plaguing?
could we be plaguing?
could you be plaguing?
could they be plaguing? 	could I have plagued?
could you have plagued?
could she have plagued?
could we have plagued?
could you have plagued?
could they have plagued? 	could I have been plaguing?
could you have been plaguing?
could she have been plaguing?
could we have been plaguing?
could you have been plaguing?
could they have been plaguing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not plague?
could you not plague?
could she not plague?
could we not plague?
could you not plague?
could they not plague? 	could I not be plaguing?
could you not be plaguing?
could she not be plaguing?
could we not be plaguing?
could you not be plaguing?
could they not be plaguing? 	could I not have plagued?
could you not have plagued?
could she not have plagued?
could we not have plagued?
could you not have plagued?
could they not have plagued? 	could I not have been plaguing?
could you not have been plaguing?
could she not have been plaguing?
could we not have been plaguing?
could you not have been plaguing?
could they not have been plaguing?