English verb conjugation
MUST STRIVE

Irregular verb: strive - strived - striven

Affirmation

Simple form	V-ing form
I must strive you must strive he must strive we must strive you must strive they must strive	I must be striving you must be striving he must be striving we must be striving you must be striving they must be striving
Perfect	V-ing perfect
I must have striven you must have striven he must have striven we must have striven you must have striven they must have striven	I must have been striving you must have been striving he must have been striving we must have been striving you must have been striving they must have been striving

Negation

Simple form	V-ing form
I must not strive you must not strive he must not strive we must not strive you must not strive they must not strive	I must not be striving you must not be striving he must not be striving we must not be striving you must not be striving they must not be striving
Perfect	V-ing perfect
I must not have striven you must not have striven he must not have striven we must not have striven you must not have striven they must not have striven	I must not have been striving you must not have been striving he must not have been striving we must not have been striving you must not have been striving they must not have been striving

Interrogative form

Simple form	V-ing form
must I strive? must you strive? must he strive? must we strive? must you strive? must they strive?	must I be striving? must you be striving? must he be striving? must we be striving? must you be striving? must they be striving?
Perfect	V-ing perfect
must I have striven? must you have striven? must he have striven? must we have striven? must you have striven? must they have striven?	must I have been striving? must you have been striving? must he have been striving? must we have been striving? must you have been striving? must they have been striving?

Interro-negative form

Simple form	V-ing form
must I not strive? must you not strive? must he not strive? must we not strive? must you not strive? must they not strive?	must I not be striving? must you not be striving? must he not be striving? must we not be striving? must you not be striving? must they not be striving?
Perfect	V-ing perfect
must I not have striven? must you not have striven? must he not have striven? must we not have striven? must you not have striven? must they not have striven?	must I not have been striving? must you not have been striving? must he not have been striving? must we not have been striving? must you not have been striving? must they not have been striving?