I can trouble you can trouble he can trouble we can trouble you can trouble they can trouble
V-ing form
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
I can have troubled you can have troubled he can have troubled we can have troubled you can have troubled they can have troubled
V-ing perfect
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
I can't trouble you can't trouble he can't trouble we can't trouble you can't trouble they can't trouble
V-ing form
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
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
V-ing perfect
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
can I trouble? can you trouble? can he trouble? can we trouble? can you trouble? can they trouble?
V-ing form
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
can I have troubled? can you have troubled? can he have troubled? can we have troubled? can you have troubled? can they have troubled?
V-ing perfect
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
can't I trouble? can't you trouble? can't he trouble? can't we trouble? can't you trouble? can't they trouble?
V-ing form
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
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?
V-ing perfect
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?