English verb conjugation
COULD TREBLE

Regular verb: treble - trebled - trebled

Affirmation

Simple form	V-ing form
I could treble you could treble he could treble we could treble you could treble they could treble	I could be trebling you could be trebling he could be trebling we could be trebling you could be trebling they could be trebling
Perfect	V-ing perfect
I could have trebled you could have trebled he could have trebled we could have trebled you could have trebled they could have trebled	I could have been trebling you could have been trebling he could have been trebling we could have been trebling you could have been trebling they could have been trebling

Negation

Simple form	V-ing form
I could not treble you could not treble he could not treble we could not treble you could not treble they could not treble	I could not be trebling you could not be trebling he could not be trebling we could not be trebling you could not be trebling they could not be trebling
Perfect	V-ing perfect
I could not have trebled you could not have trebled he could not have trebled we could not have trebled you could not have trebled they could not have trebled	I could not have been trebling you could not have been trebling he could not have been trebling we could not have been trebling you could not have been trebling they could not have been trebling

Interrogative form

Simple form	V-ing form
could I treble? could you treble? could he treble? could we treble? could you treble? could they treble?	could I be trebling? could you be trebling? could he be trebling? could we be trebling? could you be trebling? could they be trebling?
Perfect	V-ing perfect
could I have trebled? could you have trebled? could he have trebled? could we have trebled? could you have trebled? could they have trebled?	could I have been trebling? could you have been trebling? could he have been trebling? could we have been trebling? could you have been trebling? could they have been trebling?

Interro-negative form

Simple form	V-ing form
could I not treble? could you not treble? could he not treble? could we not treble? could you not treble? could they not treble?	could I not be trebling? could you not be trebling? could he not be trebling? could we not be trebling? could you not be trebling? could they not be trebling?
Perfect	V-ing perfect
could I not have trebled? could you not have trebled? could he not have trebled? could we not have trebled? could you not have trebled? could they not have trebled?	could I not have been trebling? could you not have been trebling? could he not have been trebling? could we not have been trebling? could you not have been trebling? could they not have been trebling?