can grieve
Regular verb: grieve - grieved- grieved

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

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