English verb conjugation
COULD TROUBLE

Regular verb: trouble - troubled - troubled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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