can check
Regular verb: check - checked- checked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can check
you can check
she can check
we can check
you can check
they can check 	I can be checking
you can be checking
she can be checking
we can be checking
you can be checking
they can be checking	I can have checked
you can have checked
she can have checked
we can have checked
you can have checked
they can have checked	I can have been checking
you can have been checking
she can have been checking
we can have been checking
you can have been checking
they can have been checking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot check
you cannot check
she cannot check
we cannot check
you cannot check
they cannot check 	I cannot be checking
you cannot be checking
she cannot be checking
we cannot be checking
you cannot be checking
they cannot be checking	I cannot have checked
you cannot have checked
she cannot have checked
we cannot have checked
you cannot have checked
they cannot have checked	I cannot have been checking
you cannot have been checking
she cannot have been checking
we cannot have been checking
you cannot have been checking
they cannot have been checking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I check?
can you check?
can she check?
can we check?
can you check?
can they check? 	can I be checking?
can you be checking?
can she be checking?
can we be checking?
can you be checking?
can they be checking? 	can I have checked?
can you have checked?
can she have checked?
can we have checked?
can you have checked?
can they have checked? 	can I have been checking?
can you have been checking?
can she have been checking?
can we have been checking?
can you have been checking?
can they have been checking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not check?
can you not check?
can she not check?
can we not check?
can you not check?
can they not check? 	can I not be checking?
can you not be checking?
can she not be checking?
can we not be checking?
can you not be checking?
can they not be checking? 	can I not have checked?
can you not have checked?
can she not have checked?
can we not have checked?
can you not have checked?
can they not have checked? 	can I not have been checking?
can you not have been checking?
can she not have been checking?
can we not have been checking?
can you not have been checking?
can they not have been checking?