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 mustn't trill you mustn't trill he mustn't trill we mustn't trill you mustn't trill they mustn't trill	I mustn't be trilling you mustn't be trilling he mustn't be trilling we mustn't be trilling you mustn't be trilling they mustn't be trilling
Perfect	V-ing perfect
I mustn't have trilled you mustn't have trilled he mustn't have trilled we mustn't have trilled you mustn't have trilled they mustn't have trilled	I mustn't have been trilling you mustn't have been trilling he mustn't have been trilling we mustn't have been trilling you mustn't have been trilling they mustn't 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
mustn't I trill? mustn't you trill? mustn't he trill? mustn't we trill? mustn't you trill? mustn't they trill?	mustn't I be trilling? mustn't you be trilling? mustn't he be trilling? mustn't we be trilling? mustn't you be trilling? mustn't they be trilling?
Perfect	V-ing perfect
mustn't I have trilled? mustn't you have trilled? mustn't he have trilled? mustn't we have trilled? mustn't you have trilled? mustn't they have trilled?	mustn't I have been trilling? mustn't you have been trilling? mustn't he have been trilling? mustn't we have been trilling? mustn't you have been trilling? mustn't they have been trilling?