English verb conjugation
CAN TROUBLE

Regular verb: trouble - troubled - troubled

Affirmation

Simple form	V-ing form
I can trouble you can trouble he can trouble we can trouble you can trouble they can trouble	I can be troubling you can be troubling he can be troubling we can be troubling you can be troubling they can be troubling
Perfect	V-ing perfect
I can have troubled you can have troubled he can have troubled we can have troubled you can have troubled they can have troubled	I can have been troubling you can have been troubling he can have been troubling we can have been troubling you can have been troubling they can have been troubling

Negation

Simple form	V-ing form
I can't trouble you can't trouble he can't trouble we can't trouble you can't trouble they can't trouble	I can't be troubling you can't be troubling he can't be troubling we can't be troubling you can't be troubling they can't be troubling
Perfect	V-ing perfect
I can't have troubled you can't have troubled he can't have troubled we can't have troubled you can't have troubled they can't have troubled	I can't have been troubling you can't have been troubling he can't have been troubling we can't have been troubling you can't have been troubling they can't have been troubling

Interrogative form

Simple form	V-ing form
can I trouble? can you trouble? can he trouble? can we trouble? can you trouble? can they trouble?	can I be troubling? can you be troubling? can he be troubling? can we be troubling? can you be troubling? can they be troubling?
Perfect	V-ing perfect
can I have troubled? can you have troubled? can he have troubled? can we have troubled? can you have troubled? can they have troubled?	can I have been troubling? can you have been troubling? can he have been troubling? can we have been troubling? can you have been troubling? can they have been troubling?

Interro-negative form

Simple form	V-ing form
can't I trouble? can't you trouble? can't he trouble? can't we trouble? can't you trouble? can't they trouble?	can't I be troubling? can't you be troubling? can't he be troubling? can't we be troubling? can't you be troubling? can't they be troubling?
Perfect	V-ing perfect
can't I have troubled? can't you have troubled? can't he have troubled? can't we have troubled? can't you have troubled? can't they have troubled?	can't I have been troubling? can't you have been troubling? can't he have been troubling? can't we have been troubling? can't you have been troubling? can't they have been troubling?