English verb conjugation
COULD SYMMETRISE

Regular verb: symmetrise - symmetrised - symmetrised

Affirmation

Simple form	V-ing form
I could symmetrise you could symmetrise he could symmetrise we could symmetrise you could symmetrise they could symmetrise	I could be symmetrising you could be symmetrising he could be symmetrising we could be symmetrising you could be symmetrising they could be symmetrising
Perfect	V-ing perfect
I could have symmetrised you could have symmetrised he could have symmetrised we could have symmetrised you could have symmetrised they could have symmetrised	I could have been symmetrising you could have been symmetrising he could have been symmetrising we could have been symmetrising you could have been symmetrising they could have been symmetrising

Negation

Simple form	V-ing form
I couldn't symmetrise you couldn't symmetrise he couldn't symmetrise we couldn't symmetrise you couldn't symmetrise they couldn't symmetrise	I couldn't be symmetrising you couldn't be symmetrising he couldn't be symmetrising we couldn't be symmetrising you couldn't be symmetrising they couldn't be symmetrising
Perfect	V-ing perfect
I couldn't have symmetrised you couldn't have symmetrised he couldn't have symmetrised we couldn't have symmetrised you couldn't have symmetrised they couldn't have symmetrised	I couldn't have been symmetrising you couldn't have been symmetrising he couldn't have been symmetrising we couldn't have been symmetrising you couldn't have been symmetrising they couldn't have been symmetrising

Interrogative form

Simple form	V-ing form
could I symmetrise? could you symmetrise? could he symmetrise? could we symmetrise? could you symmetrise? could they symmetrise?	could I be symmetrising? could you be symmetrising? could he be symmetrising? could we be symmetrising? could you be symmetrising? could they be symmetrising?
Perfect	V-ing perfect
could I have symmetrised? could you have symmetrised? could he have symmetrised? could we have symmetrised? could you have symmetrised? could they have symmetrised?	could I have been symmetrising? could you have been symmetrising? could he have been symmetrising? could we have been symmetrising? could you have been symmetrising? could they have been symmetrising?

Interro-negative form

Simple form	V-ing form
couldn't I symmetrise? couldn't you symmetrise? couldn't he symmetrise? couldn't we symmetrise? couldn't you symmetrise? couldn't they symmetrise?	couldn't I be symmetrising? couldn't you be symmetrising? couldn't he be symmetrising? couldn't we be symmetrising? couldn't you be symmetrising? couldn't they be symmetrising?
Perfect	V-ing perfect
couldn't I have symmetrised? couldn't you have symmetrised? couldn't he have symmetrised? couldn't we have symmetrised? couldn't you have symmetrised? couldn't they have symmetrised?	couldn't I have been symmetrising? couldn't you have been symmetrising? couldn't he have been symmetrising? couldn't we have been symmetrising? couldn't you have been symmetrising? couldn't they have been symmetrising?