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 cannot contend you cannot contend she cannot contend we cannot contend you cannot contend they cannot contend	I cannot be contending you cannot be contending she cannot be contending we cannot be contending you cannot be contending they cannot be contending
Perfect	V-ing perfect
I cannot have contended you cannot have contended she cannot have contended we cannot have contended you cannot have contended they cannot have contended	I cannot have been contending you cannot have been contending she cannot have been contending we cannot have been contending you cannot have been contending they cannot 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 I not contend? can you not contend? can she not contend? can we not contend? can you not contend? can they not contend?	can I not be contending? can you not be contending? can she not be contending? can we not be contending? can you not be contending? can they not be contending?
Perfect	V-ing perfect
can I not have contended? can you not have contended? can she not have contended? can we not have contended? can you not have contended? can they not have contended?	can I not have been contending? can you not have been contending? can she not have been contending? can we not have been contending? can you not have been contending? can they not have been contending?