English verb conjugation
COULD CONTEND

Regular verb: contend - contended - contended

Affirmation

Simple form	V-ing form
I could contend you could contend she could contend we could contend you could contend they could contend	I could be contending you could be contending she could be contending we could be contending you could be contending they could be contending
Perfect	V-ing perfect
I could have contended you could have contended she could have contended we could have contended you could have contended they could have contended	I could have been contending you could have been contending she could have been contending we could have been contending you could have been contending they could have been contending

Negation

Simple form	V-ing form
I could not contend you could not contend she could not contend we could not contend you could not contend they could not contend	I could not be contending you could not be contending she could not be contending we could not be contending you could not be contending they could not be contending
Perfect	V-ing perfect
I could not have contended you could not have contended she could not have contended we could not have contended you could not have contended they could not have contended	I could not have been contending you could not have been contending she could not have been contending we could not have been contending you could not have been contending they could not have been contending

Interrogative form

Simple form	V-ing form
could I contend? could you contend? could she contend? could we contend? could you contend? could they contend?	could I be contending? could you be contending? could she be contending? could we be contending? could you be contending? could they be contending?
Perfect	V-ing perfect
could I have contended? could you have contended? could she have contended? could we have contended? could you have contended? could they have contended?	could I have been contending? could you have been contending? could she have been contending? could we have been contending? could you have been contending? could they have been contending?

Interro-negative form

Simple form	V-ing form
could I not contend? could you not contend? could she not contend? could we not contend? could you not contend? could they not contend?	could I not be contending? could you not be contending? could she not be contending? could we not be contending? could you not be contending? could they not be contending?
Perfect	V-ing perfect
could I not have contended? could you not have contended? could she not have contended? could we not have contended? could you not have contended? could they not have contended?	could I not have been contending? could you not have been contending? could she not have been contending? could we not have been contending? could you not have been contending? could they not have been contending?