can require
Regular verb: require - required- required

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can require
you can require
she can require
we can require
you can require
they can require 	I can be requiring
you can be requiring
she can be requiring
we can be requiring
you can be requiring
they can be requiring	I can have required
you can have required
she can have required
we can have required
you can have required
they can have required	I can have been requiring
you can have been requiring
she can have been requiring
we can have been requiring
you can have been requiring
they can have been requiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot require
you cannot require
she cannot require
we cannot require
you cannot require
they cannot require 	I cannot be requiring
you cannot be requiring
she cannot be requiring
we cannot be requiring
you cannot be requiring
they cannot be requiring	I cannot have required
you cannot have required
she cannot have required
we cannot have required
you cannot have required
they cannot have required	I cannot have been requiring
you cannot have been requiring
she cannot have been requiring
we cannot have been requiring
you cannot have been requiring
they cannot have been requiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I require?
can you require?
can she require?
can we require?
can you require?
can they require? 	can I be requiring?
can you be requiring?
can she be requiring?
can we be requiring?
can you be requiring?
can they be requiring? 	can I have required?
can you have required?
can she have required?
can we have required?
can you have required?
can they have required? 	can I have been requiring?
can you have been requiring?
can she have been requiring?
can we have been requiring?
can you have been requiring?
can they have been requiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not require?
can you not require?
can she not require?
can we not require?
can you not require?
can they not require? 	can I not be requiring?
can you not be requiring?
can she not be requiring?
can we not be requiring?
can you not be requiring?
can they not be requiring? 	can I not have required?
can you not have required?
can she not have required?
can we not have required?
can you not have required?
can they not have required? 	can I not have been requiring?
can you not have been requiring?
can she not have been requiring?
can we not have been requiring?
can you not have been requiring?
can they not have been requiring?