English verb conjugation
COULD SISE

Regular verb: sise - sised - sised

Affirmation

Simple form	V-ing form
I could sise you could sise he could sise we could sise you could sise they could sise	I could be sising you could be sising he could be sising we could be sising you could be sising they could be sising
Perfect	V-ing perfect
I could have sised you could have sised he could have sised we could have sised you could have sised they could have sised	I could have been sising you could have been sising he could have been sising we could have been sising you could have been sising they could have been sising

Negation

Simple form	V-ing form
I could not sise you could not sise he could not sise we could not sise you could not sise they could not sise	I could not be sising you could not be sising he could not be sising we could not be sising you could not be sising they could not be sising
Perfect	V-ing perfect
I could not have sised you could not have sised he could not have sised we could not have sised you could not have sised they could not have sised	I could not have been sising you could not have been sising he could not have been sising we could not have been sising you could not have been sising they could not have been sising

Interrogative form

Simple form	V-ing form
could I sise? could you sise? could he sise? could we sise? could you sise? could they sise?	could I be sising? could you be sising? could he be sising? could we be sising? could you be sising? could they be sising?
Perfect	V-ing perfect
could I have sised? could you have sised? could he have sised? could we have sised? could you have sised? could they have sised?	could I have been sising? could you have been sising? could he have been sising? could we have been sising? could you have been sising? could they have been sising?

Interro-negative form

Simple form	V-ing form
could I not sise? could you not sise? could he not sise? could we not sise? could you not sise? could they not sise?	could I not be sising? could you not be sising? could he not be sising? could we not be sising? could you not be sising? could they not be sising?
Perfect	V-ing perfect
could I not have sised? could you not have sised? could he not have sised? could we not have sised? could you not have sised? could they not have sised?	could I not have been sising? could you not have been sising? could he not have been sising? could we not have been sising? could you not have been sising? could they not have been sising?