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 cannot trouble you cannot trouble he cannot trouble we cannot trouble you cannot trouble they cannot trouble
V-ing form
I cannot be troubling you cannot be troubling he cannot be troubling we cannot be troubling you cannot be troubling they cannot be troubling
Perfect
I cannot have troubled you cannot have troubled he cannot have troubled we cannot have troubled you cannot have troubled they cannot have troubled
V-ing perfect
I cannot have been troubling you cannot have been troubling he cannot have been troubling we cannot have been troubling you cannot have been troubling they cannot 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 I not trouble? can you not trouble? can he not trouble? can we not trouble? can you not trouble? can they not trouble?
V-ing form
can I not be troubling? can you not be troubling? can he not be troubling? can we not be troubling? can you not be troubling? can they not be troubling?
Perfect
can I not have troubled? can you not have troubled? can he not have troubled? can we not have troubled? can you not have troubled? can they not have troubled?
V-ing perfect
can I not have been troubling? can you not have been troubling? can he not have been troubling? can we not have been troubling? can you not have been troubling? can they not have been troubling?