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 can't mash you can't mash he can't mash we can't mash you can't mash they can't mash	I can't be mashing you can't be mashing he can't be mashing we can't be mashing you can't be mashing they can't be mashing
Perfect	V-ing perfect
I can't have mashed you can't have mashed he can't have mashed we can't have mashed you can't have mashed they can't have mashed	I can't have been mashing you can't have been mashing he can't have been mashing we can't have been mashing you can't have been mashing they can't 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't I mash? can't you mash? can't he mash? can't we mash? can't you mash? can't they mash?	can't I be mashing? can't you be mashing? can't he be mashing? can't we be mashing? can't you be mashing? can't they be mashing?
Perfect	V-ing perfect
can't I have mashed? can't you have mashed? can't he have mashed? can't we have mashed? can't you have mashed? can't they have mashed?	can't I have been mashing? can't you have been mashing? can't he have been mashing? can't we have been mashing? can't you have been mashing? can't they have been mashing?