English verb conjugation
COULD PHOTOSYNTHESISE

Regular verb: photosynthesise - photosynthesised - photosynthesised

Affirmation

Simple form	V-ing form
I could photosynthesise you could photosynthesise he could photosynthesise we could photosynthesise you could photosynthesise they could photosynthesise	I could be photosynthesising you could be photosynthesising he could be photosynthesising we could be photosynthesising you could be photosynthesising they could be photosynthesising
Perfect	V-ing perfect
I could have photosynthesised you could have photosynthesised he could have photosynthesised we could have photosynthesised you could have photosynthesised they could have photosynthesised	I could have been photosynthesising you could have been photosynthesising he could have been photosynthesising we could have been photosynthesising you could have been photosynthesising they could have been photosynthesising

Negation

Simple form	V-ing form
I could not photosynthesise you could not photosynthesise he could not photosynthesise we could not photosynthesise you could not photosynthesise they could not photosynthesise	I could not be photosynthesising you could not be photosynthesising he could not be photosynthesising we could not be photosynthesising you could not be photosynthesising they could not be photosynthesising
Perfect	V-ing perfect
I could not have photosynthesised you could not have photosynthesised he could not have photosynthesised we could not have photosynthesised you could not have photosynthesised they could not have photosynthesised	I could not have been photosynthesising you could not have been photosynthesising he could not have been photosynthesising we could not have been photosynthesising you could not have been photosynthesising they could not have been photosynthesising

Interrogative form

Simple form	V-ing form
could I photosynthesise? could you photosynthesise? could he photosynthesise? could we photosynthesise? could you photosynthesise? could they photosynthesise?	could I be photosynthesising? could you be photosynthesising? could he be photosynthesising? could we be photosynthesising? could you be photosynthesising? could they be photosynthesising?
Perfect	V-ing perfect
could I have photosynthesised? could you have photosynthesised? could he have photosynthesised? could we have photosynthesised? could you have photosynthesised? could they have photosynthesised?	could I have been photosynthesising? could you have been photosynthesising? could he have been photosynthesising? could we have been photosynthesising? could you have been photosynthesising? could they have been photosynthesising?

Interro-negative form

Simple form	V-ing form
could I not photosynthesise? could you not photosynthesise? could he not photosynthesise? could we not photosynthesise? could you not photosynthesise? could they not photosynthesise?	could I not be photosynthesising? could you not be photosynthesising? could he not be photosynthesising? could we not be photosynthesising? could you not be photosynthesising? could they not be photosynthesising?
Perfect	V-ing perfect
could I not have photosynthesised? could you not have photosynthesised? could he not have photosynthesised? could we not have photosynthesised? could you not have photosynthesised? could they not have photosynthesised?	could I not have been photosynthesising? could you not have been photosynthesising? could he not have been photosynthesising? could we not have been photosynthesising? could you not have been photosynthesising? could they not have been photosynthesising?