English verb conjugation
MUST SKIM

Regular verb: skim - skimmed - skimmed

Affirmation

Simple form	V-ing form
I must skim you must skim he must skim we must skim you must skim they must skim	I must be skimming you must be skimming he must be skimming we must be skimming you must be skimming they must be skimming
Perfect	V-ing perfect
I must have skimmed you must have skimmed he must have skimmed we must have skimmed you must have skimmed they must have skimmed	I must have been skimming you must have been skimming he must have been skimming we must have been skimming you must have been skimming they must have been skimming

Negation

Simple form	V-ing form
I mustn't skim you mustn't skim he mustn't skim we mustn't skim you mustn't skim they mustn't skim	I mustn't be skimming you mustn't be skimming he mustn't be skimming we mustn't be skimming you mustn't be skimming they mustn't be skimming
Perfect	V-ing perfect
I mustn't have skimmed you mustn't have skimmed he mustn't have skimmed we mustn't have skimmed you mustn't have skimmed they mustn't have skimmed	I mustn't have been skimming you mustn't have been skimming he mustn't have been skimming we mustn't have been skimming you mustn't have been skimming they mustn't have been skimming

Interrogative form

Simple form	V-ing form
must I skim? must you skim? must he skim? must we skim? must you skim? must they skim?	must I be skimming? must you be skimming? must he be skimming? must we be skimming? must you be skimming? must they be skimming?
Perfect	V-ing perfect
must I have skimmed? must you have skimmed? must he have skimmed? must we have skimmed? must you have skimmed? must they have skimmed?	must I have been skimming? must you have been skimming? must he have been skimming? must we have been skimming? must you have been skimming? must they have been skimming?

Interro-negative form

Simple form	V-ing form
mustn't I skim? mustn't you skim? mustn't he skim? mustn't we skim? mustn't you skim? mustn't they skim?	mustn't I be skimming? mustn't you be skimming? mustn't he be skimming? mustn't we be skimming? mustn't you be skimming? mustn't they be skimming?
Perfect	V-ing perfect
mustn't I have skimmed? mustn't you have skimmed? mustn't he have skimmed? mustn't we have skimmed? mustn't you have skimmed? mustn't they have skimmed?	mustn't I have been skimming? mustn't you have been skimming? mustn't he have been skimming? mustn't we have been skimming? mustn't you have been skimming? mustn't they have been skimming?