English verb conjugation
MUST RIVE

Irregular verb: rive - rived - rived, riven

Affirmation

Simple form	V-ing form
I must rive you must rive she must rive we must rive you must rive they must rive	I must be riving you must be riving she must be riving we must be riving you must be riving they must be riving
Perfect	V-ing perfect
I must have rived, riven you must have rived, riven she must have rived, riven we must have rived, riven you must have rived, riven they must have rived, riven	I must have been riving you must have been riving she must have been riving we must have been riving you must have been riving they must have been riving

Negation

Simple form	V-ing form
I mustn't rive you mustn't rive she mustn't rive we mustn't rive you mustn't rive they mustn't rive	I mustn't be riving you mustn't be riving she mustn't be riving we mustn't be riving you mustn't be riving they mustn't be riving
Perfect	V-ing perfect
I mustn't have rived, riven you mustn't have rived, riven she mustn't have rived, riven we mustn't have rived, riven you mustn't have rived, riven they mustn't have rived, riven	I mustn't have been riving you mustn't have been riving she mustn't have been riving we mustn't have been riving you mustn't have been riving they mustn't have been riving

Interrogative form

Simple form	V-ing form
must I rive? must you rive? must she rive? must we rive? must you rive? must they rive?	must I be riving? must you be riving? must she be riving? must we be riving? must you be riving? must they be riving?
Perfect	V-ing perfect
must I have rived, riven? must you have rived, riven? must she have rived, riven? must we have rived, riven? must you have rived, riven? must they have rived, riven?	must I have been riving? must you have been riving? must she have been riving? must we have been riving? must you have been riving? must they have been riving?

Interro-negative form

Simple form	V-ing form
mustn't I rive? mustn't you rive? mustn't she rive? mustn't we rive? mustn't you rive? mustn't they rive?	mustn't I be riving? mustn't you be riving? mustn't she be riving? mustn't we be riving? mustn't you be riving? mustn't they be riving?
Perfect	V-ing perfect
mustn't I have rived, riven? mustn't you have rived, riven? mustn't she have rived, riven? mustn't we have rived, riven? mustn't you have rived, riven? mustn't they have rived, riven?	mustn't I have been riving? mustn't you have been riving? mustn't she have been riving? mustn't we have been riving? mustn't you have been riving? mustn't they have been riving?