could grieve
Regular verb: grieve - grieved- grieved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could grieve
you could grieve
she could grieve
we could grieve
you could grieve
they could grieve 	I could be grieving
you could be grieving
she could be grieving
we could be grieving
you could be grieving
they could be grieving	I could have grieved
you could have grieved
she 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
she 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 	Perfect 	V-ing perfect 	
I could not grieve
you could not grieve
she could not grieve
we could not grieve
you could not grieve
they could not grieve 	I could not be grieving
you could not be grieving
she could not be grieving
we could not be grieving
you could not be grieving
they could not be grieving	I could not have grieved
you could not have grieved
she could not have grieved
we could not have grieved
you could not have grieved
they could not have grieved	I could not have been grieving
you could not have been grieving
she could not have been grieving
we could not have been grieving
you could not have been grieving
they could not have been grieving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I grieve?
could you grieve?
could she grieve?
could we grieve?
could you grieve?
could they grieve? 	could I be grieving?
could you be grieving?
could she be grieving?
could we be grieving?
could you be grieving?
could they be grieving? 	could I have grieved?
could you have grieved?
could she 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 she 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 	Perfect 	V-ing perfect 	
could I not grieve?
could you not grieve?
could she not grieve?
could we not grieve?
could you not grieve?
could they not grieve? 	could I not be grieving?
could you not be grieving?
could she not be grieving?
could we not be grieving?
could you not be grieving?
could they not be grieving? 	could I not have grieved?
could you not have grieved?
could she not have grieved?
could we not have grieved?
could you not have grieved?
could they not have grieved? 	could I not have been grieving?
could you not have been grieving?
could she not have been grieving?
could we not have been grieving?
could you not have been grieving?
could they not have been grieving?