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 couldn't sise you couldn't sise he couldn't sise we couldn't sise you couldn't sise they couldn't sise	I couldn't be sising you couldn't be sising he couldn't be sising we couldn't be sising you couldn't be sising they couldn't be sising
Perfect	V-ing perfect
I couldn't have sised you couldn't have sised he couldn't have sised we couldn't have sised you couldn't have sised they couldn't have sised	I couldn't have been sising you couldn't have been sising he couldn't have been sising we couldn't have been sising you couldn't have been sising they couldn't 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
couldn't I sise? couldn't you sise? couldn't he sise? couldn't we sise? couldn't you sise? couldn't they sise?	couldn't I be sising? couldn't you be sising? couldn't he be sising? couldn't we be sising? couldn't you be sising? couldn't they be sising?
Perfect	V-ing perfect
couldn't I have sised? couldn't you have sised? couldn't he have sised? couldn't we have sised? couldn't you have sised? couldn't they have sised?	couldn't I have been sising? couldn't you have been sising? couldn't he have been sising? couldn't we have been sising? couldn't you have been sising? couldn't they have been sising?