Conjugación del verbo inglés
COULD UNDERSTUDY

Verbo regular: understudy - understudied - understudied

Afirmación

Forma simple	Forma con V-ing
I could understudy you could understudy he could understudy we could understudy you could understudy they could understudy	I could be understudying you could be understudying he could be understudying we could be understudying you could be understudying they could be understudying
Perfecto	Perfecto con V-ing
I could have understudied you could have understudied he could have understudied we could have understudied you could have understudied they could have understudied	I could have been understudying you could have been understudying he could have been understudying we could have been understudying you could have been understudying they could have been understudying

Negación

Forma simple	Forma con V-ing
I couldn't understudy you couldn't understudy he couldn't understudy we couldn't understudy you couldn't understudy they couldn't understudy	I couldn't be understudying you couldn't be understudying he couldn't be understudying we couldn't be understudying you couldn't be understudying they couldn't be understudying
Perfecto	Perfecto con V-ing
I couldn't have understudied you couldn't have understudied he couldn't have understudied we couldn't have understudied you couldn't have understudied they couldn't have understudied	I couldn't have been understudying you couldn't have been understudying he couldn't have been understudying we couldn't have been understudying you couldn't have been understudying they couldn't have been understudying

Forma interrogativa

Forma simple	Forma con V-ing
could I understudy? could you understudy? could he understudy? could we understudy? could you understudy? could they understudy?	could I be understudying? could you be understudying? could he be understudying? could we be understudying? could you be understudying? could they be understudying?
Perfecto	Perfecto con V-ing
could I have understudied? could you have understudied? could he have understudied? could we have understudied? could you have understudied? could they have understudied?	could I have been understudying? could you have been understudying? could he have been understudying? could we have been understudying? could you have been understudying? could they have been understudying?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I understudy? couldn't you understudy? couldn't he understudy? couldn't we understudy? couldn't you understudy? couldn't they understudy?	couldn't I be understudying? couldn't you be understudying? couldn't he be understudying? couldn't we be understudying? couldn't you be understudying? couldn't they be understudying?
Perfecto	Perfecto con V-ing
couldn't I have understudied? couldn't you have understudied? couldn't he have understudied? couldn't we have understudied? couldn't you have understudied? couldn't they have understudied?	couldn't I have been understudying? couldn't you have been understudying? couldn't he have been understudying? couldn't we have been understudying? couldn't you have been understudying? couldn't they have been understudying?