English verb conjugation
COULD STRAIN

Regular verb: strain - strained - strained

Affirmation

Simple form	V-ing form
I could strain you could strain she could strain we could strain you could strain they could strain	I could be straining you could be straining she could be straining we could be straining you could be straining they could be straining
Perfect	V-ing perfect
I could have strained you could have strained she could have strained we could have strained you could have strained they could have strained	I could have been straining you could have been straining she could have been straining we could have been straining you could have been straining they could have been straining

Negation

Simple form	V-ing form
I could not strain you could not strain she could not strain we could not strain you could not strain they could not strain	I could not be straining you could not be straining she could not be straining we could not be straining you could not be straining they could not be straining
Perfect	V-ing perfect
I could not have strained you could not have strained she could not have strained we could not have strained you could not have strained they could not have strained	I could not have been straining you could not have been straining she could not have been straining we could not have been straining you could not have been straining they could not have been straining

Interrogative form

Simple form	V-ing form
could I strain? could you strain? could she strain? could we strain? could you strain? could they strain?	could I be straining? could you be straining? could she be straining? could we be straining? could you be straining? could they be straining?
Perfect	V-ing perfect
could I have strained? could you have strained? could she have strained? could we have strained? could you have strained? could they have strained?	could I have been straining? could you have been straining? could she have been straining? could we have been straining? could you have been straining? could they have been straining?

Interro-negative form

Simple form	V-ing form
could I not strain? could you not strain? could she not strain? could we not strain? could you not strain? could they not strain?	could I not be straining? could you not be straining? could she not be straining? could we not be straining? could you not be straining? could they not be straining?
Perfect	V-ing perfect
could I not have strained? could you not have strained? could she not have strained? could we not have strained? could you not have strained? could they not have strained?	could I not have been straining? could you not have been straining? could she not have been straining? could we not have been straining? could you not have been straining? could they not have been straining?