can gain
Regular verb: gain - gained- gained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can gain
you can gain
she can gain
we can gain
you can gain
they can gain 	I can be gaining
you can be gaining
she can be gaining
we can be gaining
you can be gaining
they can be gaining	I can have gained
you can have gained
she can have gained
we can have gained
you can have gained
they can have gained	I can have been gaining
you can have been gaining
she can have been gaining
we can have been gaining
you can have been gaining
they can have been gaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot gain
you cannot gain
she cannot gain
we cannot gain
you cannot gain
they cannot gain 	I cannot be gaining
you cannot be gaining
she cannot be gaining
we cannot be gaining
you cannot be gaining
they cannot be gaining	I cannot have gained
you cannot have gained
she cannot have gained
we cannot have gained
you cannot have gained
they cannot have gained	I cannot have been gaining
you cannot have been gaining
she cannot have been gaining
we cannot have been gaining
you cannot have been gaining
they cannot have been gaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I gain?
can you gain?
can she gain?
can we gain?
can you gain?
can they gain? 	can I be gaining?
can you be gaining?
can she be gaining?
can we be gaining?
can you be gaining?
can they be gaining? 	can I have gained?
can you have gained?
can she have gained?
can we have gained?
can you have gained?
can they have gained? 	can I have been gaining?
can you have been gaining?
can she have been gaining?
can we have been gaining?
can you have been gaining?
can they have been gaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not gain?
can you not gain?
can she not gain?
can we not gain?
can you not gain?
can they not gain? 	can I not be gaining?
can you not be gaining?
can she not be gaining?
can we not be gaining?
can you not be gaining?
can they not be gaining? 	can I not have gained?
can you not have gained?
can she not have gained?
can we not have gained?
can you not have gained?
can they not have gained? 	can I not have been gaining?
can you not have been gaining?
can she not have been gaining?
can we not have been gaining?
can you not have been gaining?
can they not have been gaining?