can block
Regular verb: block - blocked- blocked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can block
you can block
she can block
we can block
you can block
they can block 	I can be blocking
you can be blocking
she can be blocking
we can be blocking
you can be blocking
they can be blocking	I can have blocked
you can have blocked
she can have blocked
we can have blocked
you can have blocked
they can have blocked	I can have been blocking
you can have been blocking
she can have been blocking
we can have been blocking
you can have been blocking
they can have been blocking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot block
you cannot block
she cannot block
we cannot block
you cannot block
they cannot block 	I cannot be blocking
you cannot be blocking
she cannot be blocking
we cannot be blocking
you cannot be blocking
they cannot be blocking	I cannot have blocked
you cannot have blocked
she cannot have blocked
we cannot have blocked
you cannot have blocked
they cannot have blocked	I cannot have been blocking
you cannot have been blocking
she cannot have been blocking
we cannot have been blocking
you cannot have been blocking
they cannot have been blocking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I block?
can you block?
can she block?
can we block?
can you block?
can they block? 	can I be blocking?
can you be blocking?
can she be blocking?
can we be blocking?
can you be blocking?
can they be blocking? 	can I have blocked?
can you have blocked?
can she have blocked?
can we have blocked?
can you have blocked?
can they have blocked? 	can I have been blocking?
can you have been blocking?
can she have been blocking?
can we have been blocking?
can you have been blocking?
can they have been blocking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not block?
can you not block?
can she not block?
can we not block?
can you not block?
can they not block? 	can I not be blocking?
can you not be blocking?
can she not be blocking?
can we not be blocking?
can you not be blocking?
can they not be blocking? 	can I not have blocked?
can you not have blocked?
can she not have blocked?
can we not have blocked?
can you not have blocked?
can they not have blocked? 	can I not have been blocking?
can you not have been blocking?
can she not have been blocking?
can we not have been blocking?
can you not have been blocking?
can they not have been blocking?