can prolong
Regular verb: prolong - prolonged- prolonged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prolong
you can prolong
he can prolong
we can prolong
you can prolong
they can prolong 	I can be prolonging
you can be prolonging
he can be prolonging
we can be prolonging
you can be prolonging
they can be prolonging	I can have prolonged
you can have prolonged
he can have prolonged
we can have prolonged
you can have prolonged
they can have prolonged	I can have been prolonging
you can have been prolonging
he can have been prolonging
we can have been prolonging
you can have been prolonging
they can have been prolonging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't prolong
you can't prolong
he can't prolong
we can't prolong
you can't prolong
they can't prolong 	I can't be prolonging
you can't be prolonging
he can't be prolonging
we can't be prolonging
you can't be prolonging
they can't be prolonging	I can't have prolonged
you can't have prolonged
he can't have prolonged
we can't have prolonged
you can't have prolonged
they can't have prolonged	I can't have been prolonging
you can't have been prolonging
he can't have been prolonging
we can't have been prolonging
you can't have been prolonging
they can't have been prolonging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I prolong?
can you prolong?
can he prolong?
can we prolong?
can you prolong?
can they prolong? 	can I be prolonging?
can you be prolonging?
can he be prolonging?
can we be prolonging?
can you be prolonging?
can they be prolonging? 	can I have prolonged?
can you have prolonged?
can he have prolonged?
can we have prolonged?
can you have prolonged?
can they have prolonged? 	can I have been prolonging?
can you have been prolonging?
can he have been prolonging?
can we have been prolonging?
can you have been prolonging?
can they have been prolonging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I prolong?
can't you prolong?
can't he prolong?
can't we prolong?
can't you prolong?
can't they prolong? 	can't I be prolonging?
can't you be prolonging?
can't he be prolonging?
can't we be prolonging?
can't you be prolonging?
can't they be prolonging? 	can't I have prolonged?
can't you have prolonged?
can't he have prolonged?
can't we have prolonged?
can't you have prolonged?
can't they have prolonged? 	can't I have been prolonging?
can't you have been prolonging?
can't he have been prolonging?
can't we have been prolonging?
can't you have been prolonging?
can't they have been prolonging?