English verb conjugation
MUST PRECLEAN

Regular verb: preclean - precleaned - precleaned

Affirmation

Simple form	V-ing form
I must preclean you must preclean he must preclean we must preclean you must preclean they must preclean	I must be precleaning you must be precleaning he must be precleaning we must be precleaning you must be precleaning they must be precleaning
Perfect	V-ing perfect
I must have precleaned you must have precleaned he must have precleaned we must have precleaned you must have precleaned they must have precleaned	I must have been precleaning you must have been precleaning he must have been precleaning we must have been precleaning you must have been precleaning they must have been precleaning

Negation

Simple form	V-ing form
I mustn't preclean you mustn't preclean he mustn't preclean we mustn't preclean you mustn't preclean they mustn't preclean	I mustn't be precleaning you mustn't be precleaning he mustn't be precleaning we mustn't be precleaning you mustn't be precleaning they mustn't be precleaning
Perfect	V-ing perfect
I mustn't have precleaned you mustn't have precleaned he mustn't have precleaned we mustn't have precleaned you mustn't have precleaned they mustn't have precleaned	I mustn't have been precleaning you mustn't have been precleaning he mustn't have been precleaning we mustn't have been precleaning you mustn't have been precleaning they mustn't have been precleaning

Interrogative form

Simple form	V-ing form
must I preclean? must you preclean? must he preclean? must we preclean? must you preclean? must they preclean?	must I be precleaning? must you be precleaning? must he be precleaning? must we be precleaning? must you be precleaning? must they be precleaning?
Perfect	V-ing perfect
must I have precleaned? must you have precleaned? must he have precleaned? must we have precleaned? must you have precleaned? must they have precleaned?	must I have been precleaning? must you have been precleaning? must he have been precleaning? must we have been precleaning? must you have been precleaning? must they have been precleaning?

Interro-negative form

Simple form	V-ing form
mustn't I preclean? mustn't you preclean? mustn't he preclean? mustn't we preclean? mustn't you preclean? mustn't they preclean?	mustn't I be precleaning? mustn't you be precleaning? mustn't he be precleaning? mustn't we be precleaning? mustn't you be precleaning? mustn't they be precleaning?
Perfect	V-ing perfect
mustn't I have precleaned? mustn't you have precleaned? mustn't he have precleaned? mustn't we have precleaned? mustn't you have precleaned? mustn't they have precleaned?	mustn't I have been precleaning? mustn't you have been precleaning? mustn't he have been precleaning? mustn't we have been precleaning? mustn't you have been precleaning? mustn't they have been precleaning?