English verb conjugation
CAN REQUIRE

Regular verb: require - required - required

Affirmation

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