English verb conjugation
MUST MASH

Regular verb: mash - mashed - mashed

Affirmation

Simple form	V-ing form
I must mash you must mash she must mash we must mash you must mash they must mash	I must be mashing you must be mashing she must be mashing we must be mashing you must be mashing they must be mashing
Perfect	V-ing perfect
I must have mashed you must have mashed she must have mashed we must have mashed you must have mashed they must have mashed	I must have been mashing you must have been mashing she must have been mashing we must have been mashing you must have been mashing they must have been mashing

Negation

Simple form	V-ing form
I mustn't mash you mustn't mash she mustn't mash we mustn't mash you mustn't mash they mustn't mash	I mustn't be mashing you mustn't be mashing she mustn't be mashing we mustn't be mashing you mustn't be mashing they mustn't be mashing
Perfect	V-ing perfect
I mustn't have mashed you mustn't have mashed she mustn't have mashed we mustn't have mashed you mustn't have mashed they mustn't have mashed	I mustn't have been mashing you mustn't have been mashing she mustn't have been mashing we mustn't have been mashing you mustn't have been mashing they mustn't have been mashing

Interrogative form

Simple form	V-ing form
must I mash? must you mash? must she mash? must we mash? must you mash? must they mash?	must I be mashing? must you be mashing? must she be mashing? must we be mashing? must you be mashing? must they be mashing?
Perfect	V-ing perfect
must I have mashed? must you have mashed? must she have mashed? must we have mashed? must you have mashed? must they have mashed?	must I have been mashing? must you have been mashing? must she have been mashing? must we have been mashing? must you have been mashing? must they have been mashing?

Interro-negative form

Simple form	V-ing form
mustn't I mash? mustn't you mash? mustn't she mash? mustn't we mash? mustn't you mash? mustn't they mash?	mustn't I be mashing? mustn't you be mashing? mustn't she be mashing? mustn't we be mashing? mustn't you be mashing? mustn't they be mashing?
Perfect	V-ing perfect
mustn't I have mashed? mustn't you have mashed? mustn't she have mashed? mustn't we have mashed? mustn't you have mashed? mustn't they have mashed?	mustn't I have been mashing? mustn't you have been mashing? mustn't she have been mashing? mustn't we have been mashing? mustn't you have been mashing? mustn't they have been mashing?