English verb conjugation
CAN REQUIRE

Regular verb: require - required - required

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I can't require you can't require she can't require we can't require you can't require they can't require	I can't be requiring you can't be requiring she can't be requiring we can't be requiring you can't be requiring they can't be requiring
Perfect	V-ing perfect
I can't have required you can't have required she can't have required we can't have required you can't have required they can't have required	I can't have been requiring you can't have been requiring she can't have been requiring we can't have been requiring you can't have been requiring they can't have been requiring

Interrogative form

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