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 can't grass you can't grass he can't grass we can't grass you can't grass they can't grass	I can't be grassing you can't be grassing he can't be grassing we can't be grassing you can't be grassing they can't be grassing
Perfect	V-ing perfect
I can't have grassed you can't have grassed he can't have grassed we can't have grassed you can't have grassed they can't have grassed	I can't have been grassing you can't have been grassing he can't have been grassing we can't have been grassing you can't have been grassing they can't 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't I grass? can't you grass? can't he grass? can't we grass? can't you grass? can't they grass?	can't I be grassing? can't you be grassing? can't he be grassing? can't we be grassing? can't you be grassing? can't they be grassing?
Perfect	V-ing perfect
can't I have grassed? can't you have grassed? can't he have grassed? can't we have grassed? can't you have grassed? can't they have grassed?	can't I have been grassing? can't you have been grassing? can't he have been grassing? can't we have been grassing? can't you have been grassing? can't they have been grassing?