could trouble
Regular verb: trouble - troubled- troubled

Affirmation 	
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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	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 	
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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	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 	
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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? 	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 	
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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? 	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?