English verb conjugation
CAN GRIEVE

Regular verb: grieve - grieved - grieved

Affirmation

Simple form	V-ing form
I can grieve you can grieve he can grieve we can grieve you can grieve they can grieve	I can be grieving you can be grieving he can be grieving we can be grieving you can be grieving they can be grieving
Perfect	V-ing perfect
I can have grieved you can have grieved he can have grieved we can have grieved you can have grieved they can have grieved	I can have been grieving you can have been grieving he can have been grieving we can have been grieving you can have been grieving they can have been grieving

Negation

Simple form	V-ing form
I can't grieve you can't grieve he can't grieve we can't grieve you can't grieve they can't grieve	I can't be grieving you can't be grieving he can't be grieving we can't be grieving you can't be grieving they can't be grieving
Perfect	V-ing perfect
I can't have grieved you can't have grieved he can't have grieved we can't have grieved you can't have grieved they can't have grieved	I can't have been grieving you can't have been grieving he can't have been grieving we can't have been grieving you can't have been grieving they can't have been grieving

Interrogative form

Simple form	V-ing form
can I grieve? can you grieve? can he grieve? can we grieve? can you grieve? can they grieve?	can I be grieving? can you be grieving? can he be grieving? can we be grieving? can you be grieving? can they be grieving?
Perfect	V-ing perfect
can I have grieved? can you have grieved? can he have grieved? can we have grieved? can you have grieved? can they have grieved?	can I have been grieving? can you have been grieving? can he have been grieving? can we have been grieving? can you have been grieving? can they have been grieving?

Interro-negative form

Simple form	V-ing form
can't I grieve? can't you grieve? can't he grieve? can't we grieve? can't you grieve? can't they grieve?	can't I be grieving? can't you be grieving? can't he be grieving? can't we be grieving? can't you be grieving? can't they be grieving?
Perfect	V-ing perfect
can't I have grieved? can't you have grieved? can't he have grieved? can't we have grieved? can't you have grieved? can't they have grieved?	can't I have been grieving? can't you have been grieving? can't he have been grieving? can't we have been grieving? can't you have been grieving? can't they have been grieving?