English verb conjugation
CAN CONTEND

Regular verb: contend - contended - contended

Affirmation

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

Negation

Simple form	V-ing form
I can't contend you can't contend she can't contend we can't contend you can't contend they can't contend	I can't be contending you can't be contending she can't be contending we can't be contending you can't be contending they can't be contending
Perfect	V-ing perfect
I can't have contended you can't have contended she can't have contended we can't have contended you can't have contended they can't have contended	I can't have been contending you can't have been contending she can't have been contending we can't have been contending you can't have been contending they can't have been contending

Interrogative form

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

Interro-negative form

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