English verb conjugation
MUST MASH

Regular verb: mash - mashed - mashed

Affirmation

Simple form	V-ing form
I must mash you must mash he must mash we must mash you must mash they must mash	I must be mashing you must be mashing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he mash? must we mash? must you mash? must they mash?	must I be mashing? must you be mashing? must he 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 he 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 he 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 he 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 he 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 he 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 he have been mashing? mustn't we have been mashing? mustn't you have been mashing? mustn't they have been mashing?