English verb conjugation
CAN GRIN

Regular verb: grin - grinned - grinned

Affirmation

Simple form	V-ing form
I can grin you can grin he can grin we can grin you can grin they can grin	I can be grinning you can be grinning he can be grinning we can be grinning you can be grinning they can be grinning
Perfect	V-ing perfect
I can have grinned you can have grinned he can have grinned we can have grinned you can have grinned they can have grinned	I can have been grinning you can have been grinning he can have been grinning we can have been grinning you can have been grinning they can have been grinning

Negation

Simple form	V-ing form
I cannot grin you cannot grin he cannot grin we cannot grin you cannot grin they cannot grin	I cannot be grinning you cannot be grinning he cannot be grinning we cannot be grinning you cannot be grinning they cannot be grinning
Perfect	V-ing perfect
I cannot have grinned you cannot have grinned he cannot have grinned we cannot have grinned you cannot have grinned they cannot have grinned	I cannot have been grinning you cannot have been grinning he cannot have been grinning we cannot have been grinning you cannot have been grinning they cannot have been grinning

Interrogative form

Simple form	V-ing form
can I grin? can you grin? can he grin? can we grin? can you grin? can they grin?	can I be grinning? can you be grinning? can he be grinning? can we be grinning? can you be grinning? can they be grinning?
Perfect	V-ing perfect
can I have grinned? can you have grinned? can he have grinned? can we have grinned? can you have grinned? can they have grinned?	can I have been grinning? can you have been grinning? can he have been grinning? can we have been grinning? can you have been grinning? can they have been grinning?

Interro-negative form

Simple form	V-ing form
can I not grin? can you not grin? can he not grin? can we not grin? can you not grin? can they not grin?	can I not be grinning? can you not be grinning? can he not be grinning? can we not be grinning? can you not be grinning? can they not be grinning?
Perfect	V-ing perfect
can I not have grinned? can you not have grinned? can he not have grinned? can we not have grinned? can you not have grinned? can they not have grinned?	can I not have been grinning? can you not have been grinning? can he not have been grinning? can we not have been grinning? can you not have been grinning? can they not have been grinning?