English verb conjugation
CAN LAUGH

Regular verb: laugh - laughed - laughed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not laugh? can you not laugh? can he not laugh? can we not laugh? can you not laugh? can they not laugh?	can I not be laughing? can you not be laughing? can he not be laughing? can we not be laughing? can you not be laughing? can they not be laughing?
Perfect	V-ing perfect
can I not have laughed? can you not have laughed? can he not have laughed? can we not have laughed? can you not have laughed? can they not have laughed?	can I not have been laughing? can you not have been laughing? can he not have been laughing? can we not have been laughing? can you not have been laughing? can they not have been laughing?