English verb conjugation
COULD FOSSILISE

Regular verb: fossilise - fossilised - fossilised

Affirmation

Simple form	V-ing form
I could fossilise you could fossilise he could fossilise we could fossilise you could fossilise they could fossilise	I could be fossilising you could be fossilising he could be fossilising we could be fossilising you could be fossilising they could be fossilising
Perfect	V-ing perfect
I could have fossilised you could have fossilised he could have fossilised we could have fossilised you could have fossilised they could have fossilised	I could have been fossilising you could have been fossilising he could have been fossilising we could have been fossilising you could have been fossilising they could have been fossilising

Negation

Simple form	V-ing form
I couldn't fossilise you couldn't fossilise he couldn't fossilise we couldn't fossilise you couldn't fossilise they couldn't fossilise	I couldn't be fossilising you couldn't be fossilising he couldn't be fossilising we couldn't be fossilising you couldn't be fossilising they couldn't be fossilising
Perfect	V-ing perfect
I couldn't have fossilised you couldn't have fossilised he couldn't have fossilised we couldn't have fossilised you couldn't have fossilised they couldn't have fossilised	I couldn't have been fossilising you couldn't have been fossilising he couldn't have been fossilising we couldn't have been fossilising you couldn't have been fossilising they couldn't have been fossilising

Interrogative form

Simple form	V-ing form
could I fossilise? could you fossilise? could he fossilise? could we fossilise? could you fossilise? could they fossilise?	could I be fossilising? could you be fossilising? could he be fossilising? could we be fossilising? could you be fossilising? could they be fossilising?
Perfect	V-ing perfect
could I have fossilised? could you have fossilised? could he have fossilised? could we have fossilised? could you have fossilised? could they have fossilised?	could I have been fossilising? could you have been fossilising? could he have been fossilising? could we have been fossilising? could you have been fossilising? could they have been fossilising?

Interro-negative form

Simple form	V-ing form
couldn't I fossilise? couldn't you fossilise? couldn't he fossilise? couldn't we fossilise? couldn't you fossilise? couldn't they fossilise?	couldn't I be fossilising? couldn't you be fossilising? couldn't he be fossilising? couldn't we be fossilising? couldn't you be fossilising? couldn't they be fossilising?
Perfect	V-ing perfect
couldn't I have fossilised? couldn't you have fossilised? couldn't he have fossilised? couldn't we have fossilised? couldn't you have fossilised? couldn't they have fossilised?	couldn't I have been fossilising? couldn't you have been fossilising? couldn't he have been fossilising? couldn't we have been fossilising? couldn't you have been fossilising? couldn't they have been fossilising?