English verb conjugation
MUST TRILL

Regular verb: trill - trilled - trilled

Affirmation

Simple form	V-ing form
I must trill you must trill he must trill we must trill you must trill they must trill	I must be trilling you must be trilling he must be trilling we must be trilling you must be trilling they must be trilling
Perfect	V-ing perfect
I must have trilled you must have trilled he must have trilled we must have trilled you must have trilled they must have trilled	I must have been trilling you must have been trilling he must have been trilling we must have been trilling you must have been trilling they must have been trilling

Negation

Simple form	V-ing form
I must not trill you must not trill he must not trill we must not trill you must not trill they must not trill	I must not be trilling you must not be trilling he must not be trilling we must not be trilling you must not be trilling they must not be trilling
Perfect	V-ing perfect
I must not have trilled you must not have trilled he must not have trilled we must not have trilled you must not have trilled they must not have trilled	I must not have been trilling you must not have been trilling he must not have been trilling we must not have been trilling you must not have been trilling they must not have been trilling

Interrogative form

Simple form	V-ing form
must I trill? must you trill? must he trill? must we trill? must you trill? must they trill?	must I be trilling? must you be trilling? must he be trilling? must we be trilling? must you be trilling? must they be trilling?
Perfect	V-ing perfect
must I have trilled? must you have trilled? must he have trilled? must we have trilled? must you have trilled? must they have trilled?	must I have been trilling? must you have been trilling? must he have been trilling? must we have been trilling? must you have been trilling? must they have been trilling?

Interro-negative form

Simple form	V-ing form
must I not trill? must you not trill? must he not trill? must we not trill? must you not trill? must they not trill?	must I not be trilling? must you not be trilling? must he not be trilling? must we not be trilling? must you not be trilling? must they not be trilling?
Perfect	V-ing perfect
must I not have trilled? must you not have trilled? must he not have trilled? must we not have trilled? must you not have trilled? must they not have trilled?	must I not have been trilling? must you not have been trilling? must he not have been trilling? must we not have been trilling? must you not have been trilling? must they not have been trilling?