I could photosensitise you could photosensitise he could photosensitise we could photosensitise you could photosensitise they could photosensitise
V-ing form
I could be photosensitising you could be photosensitising he could be photosensitising we could be photosensitising you could be photosensitising they could be photosensitising
Perfect
I could have photosensitised you could have photosensitised he could have photosensitised we could have photosensitised you could have photosensitised they could have photosensitised
V-ing perfect
I could have been photosensitising you could have been photosensitising he could have been photosensitising we could have been photosensitising you could have been photosensitising they could have been photosensitising
Negation
Simple form
I couldn't photosensitise you couldn't photosensitise he couldn't photosensitise we couldn't photosensitise you couldn't photosensitise they couldn't photosensitise
V-ing form
I couldn't be photosensitising you couldn't be photosensitising he couldn't be photosensitising we couldn't be photosensitising you couldn't be photosensitising they couldn't be photosensitising
Perfect
I couldn't have photosensitised you couldn't have photosensitised he couldn't have photosensitised we couldn't have photosensitised you couldn't have photosensitised they couldn't have photosensitised
V-ing perfect
I couldn't have been photosensitising you couldn't have been photosensitising he couldn't have been photosensitising we couldn't have been photosensitising you couldn't have been photosensitising they couldn't have been photosensitising
Interrogative form
Simple form
could I photosensitise? could you photosensitise? could he photosensitise? could we photosensitise? could you photosensitise? could they photosensitise?
V-ing form
could I be photosensitising? could you be photosensitising? could he be photosensitising? could we be photosensitising? could you be photosensitising? could they be photosensitising?
Perfect
could I have photosensitised? could you have photosensitised? could he have photosensitised? could we have photosensitised? could you have photosensitised? could they have photosensitised?
V-ing perfect
could I have been photosensitising? could you have been photosensitising? could he have been photosensitising? could we have been photosensitising? could you have been photosensitising? could they have been photosensitising?
Interro-negative form
Simple form
couldn't I photosensitise? couldn't you photosensitise? couldn't he photosensitise? couldn't we photosensitise? couldn't you photosensitise? couldn't they photosensitise?
V-ing form
couldn't I be photosensitising? couldn't you be photosensitising? couldn't he be photosensitising? couldn't we be photosensitising? couldn't you be photosensitising? couldn't they be photosensitising?
Perfect
couldn't I have photosensitised? couldn't you have photosensitised? couldn't he have photosensitised? couldn't we have photosensitised? couldn't you have photosensitised? couldn't they have photosensitised?
V-ing perfect
couldn't I have been photosensitising? couldn't you have been photosensitising? couldn't he have been photosensitising? couldn't we have been photosensitising? couldn't you have been photosensitising? couldn't they have been photosensitising?