English verb conjugation
COULD REQUIRE

Regular verb: require - required - required

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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