English verb conjugation
COULD OVERSTRAIN

Regular verb: overstrain - overstrained - overstrained

Affirmation

Simple form	V-ing form
I could overstrain you could overstrain he could overstrain we could overstrain you could overstrain they could overstrain	I could be overstraining you could be overstraining he could be overstraining we could be overstraining you could be overstraining they could be overstraining
Perfect	V-ing perfect
I could have overstrained you could have overstrained he could have overstrained we could have overstrained you could have overstrained they could have overstrained	I could have been overstraining you could have been overstraining he could have been overstraining we could have been overstraining you could have been overstraining they could have been overstraining

Negation

Simple form	V-ing form
I couldn't overstrain you couldn't overstrain he couldn't overstrain we couldn't overstrain you couldn't overstrain they couldn't overstrain	I couldn't be overstraining you couldn't be overstraining he couldn't be overstraining we couldn't be overstraining you couldn't be overstraining they couldn't be overstraining
Perfect	V-ing perfect
I couldn't have overstrained you couldn't have overstrained he couldn't have overstrained we couldn't have overstrained you couldn't have overstrained they couldn't have overstrained	I couldn't have been overstraining you couldn't have been overstraining he couldn't have been overstraining we couldn't have been overstraining you couldn't have been overstraining they couldn't have been overstraining

Interrogative form

Simple form	V-ing form
could I overstrain? could you overstrain? could he overstrain? could we overstrain? could you overstrain? could they overstrain?	could I be overstraining? could you be overstraining? could he be overstraining? could we be overstraining? could you be overstraining? could they be overstraining?
Perfect	V-ing perfect
could I have overstrained? could you have overstrained? could he have overstrained? could we have overstrained? could you have overstrained? could they have overstrained?	could I have been overstraining? could you have been overstraining? could he have been overstraining? could we have been overstraining? could you have been overstraining? could they have been overstraining?

Interro-negative form

Simple form	V-ing form
couldn't I overstrain? couldn't you overstrain? couldn't he overstrain? couldn't we overstrain? couldn't you overstrain? couldn't they overstrain?	couldn't I be overstraining? couldn't you be overstraining? couldn't he be overstraining? couldn't we be overstraining? couldn't you be overstraining? couldn't they be overstraining?
Perfect	V-ing perfect
couldn't I have overstrained? couldn't you have overstrained? couldn't he have overstrained? couldn't we have overstrained? couldn't you have overstrained? couldn't they have overstrained?	couldn't I have been overstraining? couldn't you have been overstraining? couldn't he have been overstraining? couldn't we have been overstraining? couldn't you have been overstraining? couldn't they have been overstraining?