English verb conjugation
MUST SUCK

Regular verb: suck - sucked - sucked

Affirmation

Simple form	V-ing form
I must suck you must suck she must suck we must suck you must suck they must suck	I must be sucking you must be sucking she must be sucking we must be sucking you must be sucking they must be sucking
Perfect	V-ing perfect
I must have sucked you must have sucked she must have sucked we must have sucked you must have sucked they must have sucked	I must have been sucking you must have been sucking she must have been sucking we must have been sucking you must have been sucking they must have been sucking

Negation

Simple form	V-ing form
I mustn't suck you mustn't suck she mustn't suck we mustn't suck you mustn't suck they mustn't suck	I mustn't be sucking you mustn't be sucking she mustn't be sucking we mustn't be sucking you mustn't be sucking they mustn't be sucking
Perfect	V-ing perfect
I mustn't have sucked you mustn't have sucked she mustn't have sucked we mustn't have sucked you mustn't have sucked they mustn't have sucked	I mustn't have been sucking you mustn't have been sucking she mustn't have been sucking we mustn't have been sucking you mustn't have been sucking they mustn't have been sucking

Interrogative form

Simple form	V-ing form
must I suck? must you suck? must she suck? must we suck? must you suck? must they suck?	must I be sucking? must you be sucking? must she be sucking? must we be sucking? must you be sucking? must they be sucking?
Perfect	V-ing perfect
must I have sucked? must you have sucked? must she have sucked? must we have sucked? must you have sucked? must they have sucked?	must I have been sucking? must you have been sucking? must she have been sucking? must we have been sucking? must you have been sucking? must they have been sucking?

Interro-negative form

Simple form	V-ing form
mustn't I suck? mustn't you suck? mustn't she suck? mustn't we suck? mustn't you suck? mustn't they suck?	mustn't I be sucking? mustn't you be sucking? mustn't she be sucking? mustn't we be sucking? mustn't you be sucking? mustn't they be sucking?
Perfect	V-ing perfect
mustn't I have sucked? mustn't you have sucked? mustn't she have sucked? mustn't we have sucked? mustn't you have sucked? mustn't they have sucked?	mustn't I have been sucking? mustn't you have been sucking? mustn't she have been sucking? mustn't we have been sucking? mustn't you have been sucking? mustn't they have been sucking?