English verb conjugation
CAN GAIN

Regular verb: gain - gained - gained

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?