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 couldn't contend you couldn't contend she couldn't contend we couldn't contend you couldn't contend they couldn't contend	I couldn't be contending you couldn't be contending she couldn't be contending we couldn't be contending you couldn't be contending they couldn't be contending
Perfect	V-ing perfect
I couldn't have contended you couldn't have contended she couldn't have contended we couldn't have contended you couldn't have contended they couldn't have contended	I couldn't have been contending you couldn't have been contending she couldn't have been contending we couldn't have been contending you couldn't have been contending they couldn't 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
couldn't I contend? couldn't you contend? couldn't she contend? couldn't we contend? couldn't you contend? couldn't they contend?	couldn't I be contending? couldn't you be contending? couldn't she be contending? couldn't we be contending? couldn't you be contending? couldn't they be contending?
Perfect	V-ing perfect
couldn't I have contended? couldn't you have contended? couldn't she have contended? couldn't we have contended? couldn't you have contended? couldn't they have contended?	couldn't I have been contending? couldn't you have been contending? couldn't she have been contending? couldn't we have been contending? couldn't you have been contending? couldn't they have been contending?