can complain
Regular verb: complain - complained- complained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can complain
you can complain
he can complain
we can complain
you can complain
they can complain 	I can be complaining
you can be complaining
he can be complaining
we can be complaining
you can be complaining
they can be complaining	I can have complained
you can have complained
he 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
he 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 	Perfect 	V-ing perfect 	
I cannot complain
you cannot complain
he cannot complain
we cannot complain
you cannot complain
they cannot complain 	I cannot be complaining
you cannot be complaining
he cannot be complaining
we cannot be complaining
you cannot be complaining
they cannot be complaining	I cannot have complained
you cannot have complained
he cannot have complained
we cannot have complained
you cannot have complained
they cannot have complained	I cannot have been complaining
you cannot have been complaining
he cannot have been complaining
we cannot have been complaining
you cannot have been complaining
they cannot have been complaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I complain?
can you complain?
can he complain?
can we complain?
can you complain?
can they complain? 	can I be complaining?
can you be complaining?
can he be complaining?
can we be complaining?
can you be complaining?
can they be complaining? 	can I have complained?
can you have complained?
can he 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 he 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 	Perfect 	V-ing perfect 	
can I not complain?
can you not complain?
can he not complain?
can we not complain?
can you not complain?
can they not complain? 	can I not be complaining?
can you not be complaining?
can he not be complaining?
can we not be complaining?
can you not be complaining?
can they not be complaining? 	can I not have complained?
can you not have complained?
can he not have complained?
can we not have complained?
can you not have complained?
can they not have complained? 	can I not have been complaining?
can you not have been complaining?
can he not have been complaining?
can we not have been complaining?
can you not have been complaining?
can they not have been complaining?