English verb conjugation
COULD GRIEVE

Regular verb: grieve - grieved - grieved

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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