English verb conjugation
CAN GRASS

Regular verb: grass - grassed - grassed

Affirmation

Simple form	V-ing form
I can grass you can grass he can grass we can grass you can grass they can grass	I can be grassing you can be grassing he can be grassing we can be grassing you can be grassing they can be grassing
Perfect	V-ing perfect
I can have grassed you can have grassed he can have grassed we can have grassed you can have grassed they can have grassed	I can have been grassing you can have been grassing he can have been grassing we can have been grassing you can have been grassing they can have been grassing

Negation

Simple form	V-ing form
I cannot grass you cannot grass he cannot grass we cannot grass you cannot grass they cannot grass	I cannot be grassing you cannot be grassing he cannot be grassing we cannot be grassing you cannot be grassing they cannot be grassing
Perfect	V-ing perfect
I cannot have grassed you cannot have grassed he cannot have grassed we cannot have grassed you cannot have grassed they cannot have grassed	I cannot have been grassing you cannot have been grassing he cannot have been grassing we cannot have been grassing you cannot have been grassing they cannot have been grassing

Interrogative form

Simple form	V-ing form
can I grass? can you grass? can he grass? can we grass? can you grass? can they grass?	can I be grassing? can you be grassing? can he be grassing? can we be grassing? can you be grassing? can they be grassing?
Perfect	V-ing perfect
can I have grassed? can you have grassed? can he have grassed? can we have grassed? can you have grassed? can they have grassed?	can I have been grassing? can you have been grassing? can he have been grassing? can we have been grassing? can you have been grassing? can they have been grassing?

Interro-negative form

Simple form	V-ing form
can I not grass? can you not grass? can he not grass? can we not grass? can you not grass? can they not grass?	can I not be grassing? can you not be grassing? can he not be grassing? can we not be grassing? can you not be grassing? can they not be grassing?
Perfect	V-ing perfect
can I not have grassed? can you not have grassed? can he not have grassed? can we not have grassed? can you not have grassed? can they not have grassed?	can I not have been grassing? can you not have been grassing? can he not have been grassing? can we not have been grassing? can you not have been grassing? can they not have been grassing?