can quintuple
Regular verb: quintuple - quintupled- quintupled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can quintuple
you can quintuple
he can quintuple
we can quintuple
you can quintuple
they can quintuple 	I can be quintupling
you can be quintupling
he can be quintupling
we can be quintupling
you can be quintupling
they can be quintupling	I can have quintupled
you can have quintupled
he can have quintupled
we can have quintupled
you can have quintupled
they can have quintupled	I can have been quintupling
you can have been quintupling
he can have been quintupling
we can have been quintupling
you can have been quintupling
they can have been quintupling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot quintuple
you cannot quintuple
he cannot quintuple
we cannot quintuple
you cannot quintuple
they cannot quintuple 	I cannot be quintupling
you cannot be quintupling
he cannot be quintupling
we cannot be quintupling
you cannot be quintupling
they cannot be quintupling	I cannot have quintupled
you cannot have quintupled
he cannot have quintupled
we cannot have quintupled
you cannot have quintupled
they cannot have quintupled	I cannot have been quintupling
you cannot have been quintupling
he cannot have been quintupling
we cannot have been quintupling
you cannot have been quintupling
they cannot have been quintupling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I quintuple?
can you quintuple?
can he quintuple?
can we quintuple?
can you quintuple?
can they quintuple? 	can I be quintupling?
can you be quintupling?
can he be quintupling?
can we be quintupling?
can you be quintupling?
can they be quintupling? 	can I have quintupled?
can you have quintupled?
can he have quintupled?
can we have quintupled?
can you have quintupled?
can they have quintupled? 	can I have been quintupling?
can you have been quintupling?
can he have been quintupling?
can we have been quintupling?
can you have been quintupling?
can they have been quintupling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not quintuple?
can you not quintuple?
can he not quintuple?
can we not quintuple?
can you not quintuple?
can they not quintuple? 	can I not be quintupling?
can you not be quintupling?
can he not be quintupling?
can we not be quintupling?
can you not be quintupling?
can they not be quintupling? 	can I not have quintupled?
can you not have quintupled?
can he not have quintupled?
can we not have quintupled?
can you not have quintupled?
can they not have quintupled? 	can I not have been quintupling?
can you not have been quintupling?
can he not have been quintupling?
can we not have been quintupling?
can you not have been quintupling?
can they not have been quintupling?