English verb conjugation
CAN UNDERSTUDY

Regular verb: understudy - understudied - understudied

Affirmation

Simple form	V-ing form
I can understudy you can understudy she can understudy we can understudy you can understudy they can understudy	I can be understudying you can be understudying she can be understudying we can be understudying you can be understudying they can be understudying
Perfect	V-ing perfect
I can have understudied you can have understudied she can have understudied we can have understudied you can have understudied they can have understudied	I can have been understudying you can have been understudying she can have been understudying we can have been understudying you can have been understudying they can have been understudying

Negation

Simple form	V-ing form
I cannot understudy you cannot understudy she cannot understudy we cannot understudy you cannot understudy they cannot understudy	I cannot be understudying you cannot be understudying she cannot be understudying we cannot be understudying you cannot be understudying they cannot be understudying
Perfect	V-ing perfect
I cannot have understudied you cannot have understudied she cannot have understudied we cannot have understudied you cannot have understudied they cannot have understudied	I cannot have been understudying you cannot have been understudying she cannot have been understudying we cannot have been understudying you cannot have been understudying they cannot have been understudying

Interrogative form

Simple form	V-ing form
can I understudy? can you understudy? can she understudy? can we understudy? can you understudy? can they understudy?	can I be understudying? can you be understudying? can she be understudying? can we be understudying? can you be understudying? can they be understudying?
Perfect	V-ing perfect
can I have understudied? can you have understudied? can she have understudied? can we have understudied? can you have understudied? can they have understudied?	can I have been understudying? can you have been understudying? can she have been understudying? can we have been understudying? can you have been understudying? can they have been understudying?

Interro-negative form

Simple form	V-ing form
can I not understudy? can you not understudy? can she not understudy? can we not understudy? can you not understudy? can they not understudy?	can I not be understudying? can you not be understudying? can she not be understudying? can we not be understudying? can you not be understudying? can they not be understudying?
Perfect	V-ing perfect
can I not have understudied? can you not have understudied? can she not have understudied? can we not have understudied? can you not have understudied? can they not have understudied?	can I not have been understudying? can you not have been understudying? can she not have been understudying? can we not have been understudying? can you not have been understudying? can they not have been understudying?