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 couldn't grieve
you couldn't grieve
she 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
she couldn't be grieving
we couldn't be grieving
you couldn't be grieving
they couldn't be grieving	I couldn't have grieved
you couldn't have grieved
she 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
she 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 	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 	
couldn't I grieve?
couldn't you grieve?
couldn't she 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 she be grieving?
couldn't we be grieving?
couldn't you be grieving?
couldn't they be grieving? 	couldn't I have grieved?
couldn't you have grieved?
couldn't she 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 she have been grieving?
couldn't we have been grieving?
couldn't you have been grieving?
couldn't they have been grieving?