English verb conjugation
COULD PARENTHESISE

Regular verb: parenthesise - parenthesised - parenthesised

Affirmation

Simple form	V-ing form
I could parenthesise you could parenthesise he could parenthesise we could parenthesise you could parenthesise they could parenthesise	I could be parenthesising you could be parenthesising he could be parenthesising we could be parenthesising you could be parenthesising they could be parenthesising
Perfect	V-ing perfect
I could have parenthesised you could have parenthesised he could have parenthesised we could have parenthesised you could have parenthesised they could have parenthesised	I could have been parenthesising you could have been parenthesising he could have been parenthesising we could have been parenthesising you could have been parenthesising they could have been parenthesising

Negation

Simple form	V-ing form
I could not parenthesise you could not parenthesise he could not parenthesise we could not parenthesise you could not parenthesise they could not parenthesise	I could not be parenthesising you could not be parenthesising he could not be parenthesising we could not be parenthesising you could not be parenthesising they could not be parenthesising
Perfect	V-ing perfect
I could not have parenthesised you could not have parenthesised he could not have parenthesised we could not have parenthesised you could not have parenthesised they could not have parenthesised	I could not have been parenthesising you could not have been parenthesising he could not have been parenthesising we could not have been parenthesising you could not have been parenthesising they could not have been parenthesising

Interrogative form

Simple form	V-ing form
could I parenthesise? could you parenthesise? could he parenthesise? could we parenthesise? could you parenthesise? could they parenthesise?	could I be parenthesising? could you be parenthesising? could he be parenthesising? could we be parenthesising? could you be parenthesising? could they be parenthesising?
Perfect	V-ing perfect
could I have parenthesised? could you have parenthesised? could he have parenthesised? could we have parenthesised? could you have parenthesised? could they have parenthesised?	could I have been parenthesising? could you have been parenthesising? could he have been parenthesising? could we have been parenthesising? could you have been parenthesising? could they have been parenthesising?

Interro-negative form

Simple form	V-ing form
could I not parenthesise? could you not parenthesise? could he not parenthesise? could we not parenthesise? could you not parenthesise? could they not parenthesise?	could I not be parenthesising? could you not be parenthesising? could he not be parenthesising? could we not be parenthesising? could you not be parenthesising? could they not be parenthesising?
Perfect	V-ing perfect
could I not have parenthesised? could you not have parenthesised? could he not have parenthesised? could we not have parenthesised? could you not have parenthesised? could they not have parenthesised?	could I not have been parenthesising? could you not have been parenthesising? could he not have been parenthesising? could we not have been parenthesising? could you not have been parenthesising? could they not have been parenthesising?