English verb conjugation
COULD LAUGH

Regular verb: laugh - laughed - laughed

Affirmation

Simple form	V-ing form
I could laugh you could laugh he could laugh we could laugh you could laugh they could laugh	I could be laughing you could be laughing he could be laughing we could be laughing you could be laughing they could be laughing
Perfect	V-ing perfect
I could have laughed you could have laughed he could have laughed we could have laughed you could have laughed they could have laughed	I could have been laughing you could have been laughing he could have been laughing we could have been laughing you could have been laughing they could have been laughing

Negation

Simple form	V-ing form
I couldn't laugh you couldn't laugh he couldn't laugh we couldn't laugh you couldn't laugh they couldn't laugh	I couldn't be laughing you couldn't be laughing he couldn't be laughing we couldn't be laughing you couldn't be laughing they couldn't be laughing
Perfect	V-ing perfect
I couldn't have laughed you couldn't have laughed he couldn't have laughed we couldn't have laughed you couldn't have laughed they couldn't have laughed	I couldn't have been laughing you couldn't have been laughing he couldn't have been laughing we couldn't have been laughing you couldn't have been laughing they couldn't have been laughing

Interrogative form

Simple form	V-ing form
could I laugh? could you laugh? could he laugh? could we laugh? could you laugh? could they laugh?	could I be laughing? could you be laughing? could he be laughing? could we be laughing? could you be laughing? could they be laughing?
Perfect	V-ing perfect
could I have laughed? could you have laughed? could he have laughed? could we have laughed? could you have laughed? could they have laughed?	could I have been laughing? could you have been laughing? could he have been laughing? could we have been laughing? could you have been laughing? could they have been laughing?

Interro-negative form

Simple form	V-ing form
couldn't I laugh? couldn't you laugh? couldn't he laugh? couldn't we laugh? couldn't you laugh? couldn't they laugh?	couldn't I be laughing? couldn't you be laughing? couldn't he be laughing? couldn't we be laughing? couldn't you be laughing? couldn't they be laughing?
Perfect	V-ing perfect
couldn't I have laughed? couldn't you have laughed? couldn't he have laughed? couldn't we have laughed? couldn't you have laughed? couldn't they have laughed?	couldn't I have been laughing? couldn't you have been laughing? couldn't he have been laughing? couldn't we have been laughing? couldn't you have been laughing? couldn't they have been laughing?