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 must not mash you must not mash he must not mash we must not mash you must not mash they must not mash	I must not be mashing you must not be mashing he must not be mashing we must not be mashing you must not be mashing they must not be mashing
Perfect	V-ing perfect
I must not have mashed you must not have mashed he must not have mashed we must not have mashed you must not have mashed they must not have mashed	I must not have been mashing you must not have been mashing he must not have been mashing we must not have been mashing you must not have been mashing they must not 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
must I not mash? must you not mash? must he not mash? must we not mash? must you not mash? must they not mash?	must I not be mashing? must you not be mashing? must he not be mashing? must we not be mashing? must you not be mashing? must they not be mashing?
Perfect	V-ing perfect
must I not have mashed? must you not have mashed? must he not have mashed? must we not have mashed? must you not have mashed? must they not have mashed?	must I not have been mashing? must you not have been mashing? must he not have been mashing? must we not have been mashing? must you not have been mashing? must they not have been mashing?