English verb conjugation
COULD WINTERISE

Regular verb: winterise - winterised - winterised

Affirmation

Simple form	V-ing form
I could winterise you could winterise he could winterise we could winterise you could winterise they could winterise	I could be winterising you could be winterising he could be winterising we could be winterising you could be winterising they could be winterising
Perfect	V-ing perfect
I could have winterised you could have winterised he could have winterised we could have winterised you could have winterised they could have winterised	I could have been winterising you could have been winterising he could have been winterising we could have been winterising you could have been winterising they could have been winterising

Negation

Simple form	V-ing form
I couldn't winterise you couldn't winterise he couldn't winterise we couldn't winterise you couldn't winterise they couldn't winterise	I couldn't be winterising you couldn't be winterising he couldn't be winterising we couldn't be winterising you couldn't be winterising they couldn't be winterising
Perfect	V-ing perfect
I couldn't have winterised you couldn't have winterised he couldn't have winterised we couldn't have winterised you couldn't have winterised they couldn't have winterised	I couldn't have been winterising you couldn't have been winterising he couldn't have been winterising we couldn't have been winterising you couldn't have been winterising they couldn't have been winterising

Interrogative form

Simple form	V-ing form
could I winterise? could you winterise? could he winterise? could we winterise? could you winterise? could they winterise?	could I be winterising? could you be winterising? could he be winterising? could we be winterising? could you be winterising? could they be winterising?
Perfect	V-ing perfect
could I have winterised? could you have winterised? could he have winterised? could we have winterised? could you have winterised? could they have winterised?	could I have been winterising? could you have been winterising? could he have been winterising? could we have been winterising? could you have been winterising? could they have been winterising?

Interro-negative form

Simple form	V-ing form
couldn't I winterise? couldn't you winterise? couldn't he winterise? couldn't we winterise? couldn't you winterise? couldn't they winterise?	couldn't I be winterising? couldn't you be winterising? couldn't he be winterising? couldn't we be winterising? couldn't you be winterising? couldn't they be winterising?
Perfect	V-ing perfect
couldn't I have winterised? couldn't you have winterised? couldn't he have winterised? couldn't we have winterised? couldn't you have winterised? couldn't they have winterised?	couldn't I have been winterising? couldn't you have been winterising? couldn't he have been winterising? couldn't we have been winterising? couldn't you have been winterising? couldn't they have been winterising?