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