can summer
Regular verb: summer - summered- summered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can summer
you can summer
he can summer
we can summer
you can summer
they can summer 	I can be summering
you can be summering
he can be summering
we can be summering
you can be summering
they can be summering	I can have summered
you can have summered
he can have summered
we can have summered
you can have summered
they can have summered	I can have been summering
you can have been summering
he can have been summering
we can have been summering
you can have been summering
they can have been summering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot summer
you cannot summer
he cannot summer
we cannot summer
you cannot summer
they cannot summer 	I cannot be summering
you cannot be summering
he cannot be summering
we cannot be summering
you cannot be summering
they cannot be summering	I cannot have summered
you cannot have summered
he cannot have summered
we cannot have summered
you cannot have summered
they cannot have summered	I cannot have been summering
you cannot have been summering
he cannot have been summering
we cannot have been summering
you cannot have been summering
they cannot have been summering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I summer?
can you summer?
can he summer?
can we summer?
can you summer?
can they summer? 	can I be summering?
can you be summering?
can he be summering?
can we be summering?
can you be summering?
can they be summering? 	can I have summered?
can you have summered?
can he have summered?
can we have summered?
can you have summered?
can they have summered? 	can I have been summering?
can you have been summering?
can he have been summering?
can we have been summering?
can you have been summering?
can they have been summering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not summer?
can you not summer?
can he not summer?
can we not summer?
can you not summer?
can they not summer? 	can I not be summering?
can you not be summering?
can he not be summering?
can we not be summering?
can you not be summering?
can they not be summering? 	can I not have summered?
can you not have summered?
can he not have summered?
can we not have summered?
can you not have summered?
can they not have summered? 	can I not have been summering?
can you not have been summering?
can he not have been summering?
can we not have been summering?
can you not have been summering?
can they not have been summering?