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 couldn't treble you couldn't treble he couldn't treble we couldn't treble you couldn't treble they couldn't treble	I couldn't be trebling you couldn't be trebling he couldn't be trebling we couldn't be trebling you couldn't be trebling they couldn't be trebling
Perfect	V-ing perfect
I couldn't have trebled you couldn't have trebled he couldn't have trebled we couldn't have trebled you couldn't have trebled they couldn't have trebled	I couldn't have been trebling you couldn't have been trebling he couldn't have been trebling we couldn't have been trebling you couldn't have been trebling they couldn't 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
couldn't I treble? couldn't you treble? couldn't he treble? couldn't we treble? couldn't you treble? couldn't they treble?	couldn't I be trebling? couldn't you be trebling? couldn't he be trebling? couldn't we be trebling? couldn't you be trebling? couldn't they be trebling?
Perfect	V-ing perfect
couldn't I have trebled? couldn't you have trebled? couldn't he have trebled? couldn't we have trebled? couldn't you have trebled? couldn't they have trebled?	couldn't I have been trebling? couldn't you have been trebling? couldn't he have been trebling? couldn't we have been trebling? couldn't you have been trebling? couldn't they have been trebling?