could forget
Irregular verb: forget - forgot- forgotten

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could forget
you could forget
she could forget
we could forget
you could forget
they could forget 	I could be forgetting
you could be forgetting
she could be forgetting
we could be forgetting
you could be forgetting
they could be forgetting	I could have forgotten
you could have forgotten
she could have forgotten
we could have forgotten
you could have forgotten
they could have forgotten	I could have been forgetting
you could have been forgetting
she could have been forgetting
we could have been forgetting
you could have been forgetting
they could have been forgetting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't forget
you couldn't forget
she couldn't forget
we couldn't forget
you couldn't forget
they couldn't forget 	I couldn't be forgetting
you couldn't be forgetting
she couldn't be forgetting
we couldn't be forgetting
you couldn't be forgetting
they couldn't be forgetting	I couldn't have forgotten
you couldn't have forgotten
she couldn't have forgotten
we couldn't have forgotten
you couldn't have forgotten
they couldn't have forgotten	I couldn't have been forgetting
you couldn't have been forgetting
she couldn't have been forgetting
we couldn't have been forgetting
you couldn't have been forgetting
they couldn't have been forgetting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I forget?
could you forget?
could she forget?
could we forget?
could you forget?
could they forget? 	could I be forgetting?
could you be forgetting?
could she be forgetting?
could we be forgetting?
could you be forgetting?
could they be forgetting? 	could I have forgotten?
could you have forgotten?
could she have forgotten?
could we have forgotten?
could you have forgotten?
could they have forgotten? 	could I have been forgetting?
could you have been forgetting?
could she have been forgetting?
could we have been forgetting?
could you have been forgetting?
could they have been forgetting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I forget?
couldn't you forget?
couldn't she forget?
couldn't we forget?
couldn't you forget?
couldn't they forget? 	couldn't I be forgetting?
couldn't you be forgetting?
couldn't she be forgetting?
couldn't we be forgetting?
couldn't you be forgetting?
couldn't they be forgetting? 	couldn't I have forgotten?
couldn't you have forgotten?
couldn't she have forgotten?
couldn't we have forgotten?
couldn't you have forgotten?
couldn't they have forgotten? 	couldn't I have been forgetting?
couldn't you have been forgetting?
couldn't she have been forgetting?
couldn't we have been forgetting?
couldn't you have been forgetting?
couldn't they have been forgetting?