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 can't understudy you can't understudy she can't understudy we can't understudy you can't understudy they can't understudy	I can't be understudying you can't be understudying she can't be understudying we can't be understudying you can't be understudying they can't be understudying
Perfect	V-ing perfect
I can't have understudied you can't have understudied she can't have understudied we can't have understudied you can't have understudied they can't have understudied	I can't have been understudying you can't have been understudying she can't have been understudying we can't have been understudying you can't have been understudying they can't 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't I understudy? can't you understudy? can't she understudy? can't we understudy? can't you understudy? can't they understudy?	can't I be understudying? can't you be understudying? can't she be understudying? can't we be understudying? can't you be understudying? can't they be understudying?
Perfect	V-ing perfect
can't I have understudied? can't you have understudied? can't she have understudied? can't we have understudied? can't you have understudied? can't they have understudied?	can't I have been understudying? can't you have been understudying? can't she have been understudying? can't we have been understudying? can't you have been understudying? can't they have been understudying?