English verb conjugation
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Regular verb: grab - grabbed - grabbed

Affirmation

Simple form	V-ing form
I must grab you must grab she must grab we must grab you must grab they must grab	I must be grabbing you must be grabbing she must be grabbing we must be grabbing you must be grabbing they must be grabbing
Perfect	V-ing perfect
I must have grabbed you must have grabbed she must have grabbed we must have grabbed you must have grabbed they must have grabbed	I must have been grabbing you must have been grabbing she must have been grabbing we must have been grabbing you must have been grabbing they must have been grabbing

Negation

Simple form	V-ing form
I must not grab you must not grab she must not grab we must not grab you must not grab they must not grab	I must not be grabbing you must not be grabbing she must not be grabbing we must not be grabbing you must not be grabbing they must not be grabbing
Perfect	V-ing perfect
I must not have grabbed you must not have grabbed she must not have grabbed we must not have grabbed you must not have grabbed they must not have grabbed	I must not have been grabbing you must not have been grabbing she must not have been grabbing we must not have been grabbing you must not have been grabbing they must not have been grabbing

Interrogative form

Simple form	V-ing form
must I grab? must you grab? must she grab? must we grab? must you grab? must they grab?	must I be grabbing? must you be grabbing? must she be grabbing? must we be grabbing? must you be grabbing? must they be grabbing?
Perfect	V-ing perfect
must I have grabbed? must you have grabbed? must she have grabbed? must we have grabbed? must you have grabbed? must they have grabbed?	must I have been grabbing? must you have been grabbing? must she have been grabbing? must we have been grabbing? must you have been grabbing? must they have been grabbing?

Interro-negative form

Simple form	V-ing form
must I not grab? must you not grab? must she not grab? must we not grab? must you not grab? must they not grab?	must I not be grabbing? must you not be grabbing? must she not be grabbing? must we not be grabbing? must you not be grabbing? must they not be grabbing?
Perfect	V-ing perfect
must I not have grabbed? must you not have grabbed? must she not have grabbed? must we not have grabbed? must you not have grabbed? must they not have grabbed?	must I not have been grabbing? must you not have been grabbing? must she not have been grabbing? must we not have been grabbing? must you not have been grabbing? must they not have been grabbing?