could lament
Regular verb: lament - lamented- lamented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lament
you could lament
she could lament
we could lament
you could lament
they could lament 	I could be lamenting
you could be lamenting
she could be lamenting
we could be lamenting
you could be lamenting
they could be lamenting	I could have lamented
you could have lamented
she could have lamented
we could have lamented
you could have lamented
they could have lamented	I could have been lamenting
you could have been lamenting
she could have been lamenting
we could have been lamenting
you could have been lamenting
they could have been lamenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't lament
you couldn't lament
she couldn't lament
we couldn't lament
you couldn't lament
they couldn't lament 	I couldn't be lamenting
you couldn't be lamenting
she couldn't be lamenting
we couldn't be lamenting
you couldn't be lamenting
they couldn't be lamenting	I couldn't have lamented
you couldn't have lamented
she couldn't have lamented
we couldn't have lamented
you couldn't have lamented
they couldn't have lamented	I couldn't have been lamenting
you couldn't have been lamenting
she couldn't have been lamenting
we couldn't have been lamenting
you couldn't have been lamenting
they couldn't have been lamenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lament?
could you lament?
could she lament?
could we lament?
could you lament?
could they lament? 	could I be lamenting?
could you be lamenting?
could she be lamenting?
could we be lamenting?
could you be lamenting?
could they be lamenting? 	could I have lamented?
could you have lamented?
could she have lamented?
could we have lamented?
could you have lamented?
could they have lamented? 	could I have been lamenting?
could you have been lamenting?
could she have been lamenting?
could we have been lamenting?
could you have been lamenting?
could they have been lamenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I lament?
couldn't you lament?
couldn't she lament?
couldn't we lament?
couldn't you lament?
couldn't they lament? 	couldn't I be lamenting?
couldn't you be lamenting?
couldn't she be lamenting?
couldn't we be lamenting?
couldn't you be lamenting?
couldn't they be lamenting? 	couldn't I have lamented?
couldn't you have lamented?
couldn't she have lamented?
couldn't we have lamented?
couldn't you have lamented?
couldn't they have lamented? 	couldn't I have been lamenting?
couldn't you have been lamenting?
couldn't she have been lamenting?
couldn't we have been lamenting?
couldn't you have been lamenting?
couldn't they have been lamenting?