English verb conjugation
COULD SYNCHRONISE

Regular verb: synchronise - synchronised - synchronised

Affirmation

Simple form	V-ing form
I could synchronise you could synchronise he could synchronise we could synchronise you could synchronise they could synchronise	I could be synchronising you could be synchronising he could be synchronising we could be synchronising you could be synchronising they could be synchronising
Perfect	V-ing perfect
I could have synchronised you could have synchronised he could have synchronised we could have synchronised you could have synchronised they could have synchronised	I could have been synchronising you could have been synchronising he could have been synchronising we could have been synchronising you could have been synchronising they could have been synchronising

Negation

Simple form	V-ing form
I couldn't synchronise you couldn't synchronise he couldn't synchronise we couldn't synchronise you couldn't synchronise they couldn't synchronise	I couldn't be synchronising you couldn't be synchronising he couldn't be synchronising we couldn't be synchronising you couldn't be synchronising they couldn't be synchronising
Perfect	V-ing perfect
I couldn't have synchronised you couldn't have synchronised he couldn't have synchronised we couldn't have synchronised you couldn't have synchronised they couldn't have synchronised	I couldn't have been synchronising you couldn't have been synchronising he couldn't have been synchronising we couldn't have been synchronising you couldn't have been synchronising they couldn't have been synchronising

Interrogative form

Simple form	V-ing form
could I synchronise? could you synchronise? could he synchronise? could we synchronise? could you synchronise? could they synchronise?	could I be synchronising? could you be synchronising? could he be synchronising? could we be synchronising? could you be synchronising? could they be synchronising?
Perfect	V-ing perfect
could I have synchronised? could you have synchronised? could he have synchronised? could we have synchronised? could you have synchronised? could they have synchronised?	could I have been synchronising? could you have been synchronising? could he have been synchronising? could we have been synchronising? could you have been synchronising? could they have been synchronising?

Interro-negative form

Simple form	V-ing form
couldn't I synchronise? couldn't you synchronise? couldn't he synchronise? couldn't we synchronise? couldn't you synchronise? couldn't they synchronise?	couldn't I be synchronising? couldn't you be synchronising? couldn't he be synchronising? couldn't we be synchronising? couldn't you be synchronising? couldn't they be synchronising?
Perfect	V-ing perfect
couldn't I have synchronised? couldn't you have synchronised? couldn't he have synchronised? couldn't we have synchronised? couldn't you have synchronised? couldn't they have synchronised?	couldn't I have been synchronising? couldn't you have been synchronising? couldn't he have been synchronising? couldn't we have been synchronising? couldn't you have been synchronising? couldn't they have been synchronising?