English verb conjugation
MUST RIVE

Irregular verb: rive - rived - rived, riven

Affirmation

Simple form	V-ing form
I must rive you must rive he must rive we must rive you must rive they must rive	I must be riving you must be riving he 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 he 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 he 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 he 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 he 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 he 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 he 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 he rive? must we rive? must you rive? must they rive?	must I be riving? must you be riving? must he 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 he 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 he 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 he 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 he 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 he 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 he have been riving? mustn't we have been riving? mustn't you have been riving? mustn't they have been riving?