English verb conjugation
CAN MASH

Regular verb: mash - mashed - mashed

Affirmation

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

Negation

Simple form	V-ing form
I cannot mash you cannot mash he cannot mash we cannot mash you cannot mash they cannot mash	I cannot be mashing you cannot be mashing he cannot be mashing we cannot be mashing you cannot be mashing they cannot be mashing
Perfect	V-ing perfect
I cannot have mashed you cannot have mashed he cannot have mashed we cannot have mashed you cannot have mashed they cannot have mashed	I cannot have been mashing you cannot have been mashing he cannot have been mashing we cannot have been mashing you cannot have been mashing they cannot have been mashing

Interrogative form

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

Interro-negative form

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