English verb conjugation
CAN COMPLAIN

Regular verb: complain - complained - complained

Affirmation

Simple form	V-ing form
I can complain you can complain she can complain we can complain you can complain they can complain	I can be complaining you can be complaining she can be complaining we can be complaining you can be complaining they can be complaining
Perfect	V-ing perfect
I can have complained you can have complained she can have complained we can have complained you can have complained they can have complained	I can have been complaining you can have been complaining she can have been complaining we can have been complaining you can have been complaining they can have been complaining

Negation

Simple form	V-ing form
I can't complain you can't complain she can't complain we can't complain you can't complain they can't complain	I can't be complaining you can't be complaining she can't be complaining we can't be complaining you can't be complaining they can't be complaining
Perfect	V-ing perfect
I can't have complained you can't have complained she can't have complained we can't have complained you can't have complained they can't have complained	I can't have been complaining you can't have been complaining she can't have been complaining we can't have been complaining you can't have been complaining they can't have been complaining

Interrogative form

Simple form	V-ing form
can I complain? can you complain? can she complain? can we complain? can you complain? can they complain?	can I be complaining? can you be complaining? can she be complaining? can we be complaining? can you be complaining? can they be complaining?
Perfect	V-ing perfect
can I have complained? can you have complained? can she have complained? can we have complained? can you have complained? can they have complained?	can I have been complaining? can you have been complaining? can she have been complaining? can we have been complaining? can you have been complaining? can they have been complaining?

Interro-negative form

Simple form	V-ing form
can't I complain? can't you complain? can't she complain? can't we complain? can't you complain? can't they complain?	can't I be complaining? can't you be complaining? can't she be complaining? can't we be complaining? can't you be complaining? can't they be complaining?
Perfect	V-ing perfect
can't I have complained? can't you have complained? can't she have complained? can't we have complained? can't you have complained? can't they have complained?	can't I have been complaining? can't you have been complaining? can't she have been complaining? can't we have been complaining? can't you have been complaining? can't they have been complaining?