I could cross-fertilise you could cross-fertilise he could cross-fertilise we could cross-fertilise you could cross-fertilise they could cross-fertilise
V-ing form
I could be cross-fertilising you could be cross-fertilising he could be cross-fertilising we could be cross-fertilising you could be cross-fertilising they could be cross-fertilising
Perfect
I could have cross-fertilised you could have cross-fertilised he could have cross-fertilised we could have cross-fertilised you could have cross-fertilised they could have cross-fertilised
V-ing perfect
I could have been cross-fertilising you could have been cross-fertilising he could have been cross-fertilising we could have been cross-fertilising you could have been cross-fertilising they could have been cross-fertilising
Negation
Simple form
I could not cross-fertilise you could not cross-fertilise he could not cross-fertilise we could not cross-fertilise you could not cross-fertilise they could not cross-fertilise
V-ing form
I could not be cross-fertilising you could not be cross-fertilising he could not be cross-fertilising we could not be cross-fertilising you could not be cross-fertilising they could not be cross-fertilising
Perfect
I could not have cross-fertilised you could not have cross-fertilised he could not have cross-fertilised we could not have cross-fertilised you could not have cross-fertilised they could not have cross-fertilised
V-ing perfect
I could not have been cross-fertilising you could not have been cross-fertilising he could not have been cross-fertilising we could not have been cross-fertilising you could not have been cross-fertilising they could not have been cross-fertilising
Interrogative form
Simple form
could I cross-fertilise? could you cross-fertilise? could he cross-fertilise? could we cross-fertilise? could you cross-fertilise? could they cross-fertilise?
V-ing form
could I be cross-fertilising? could you be cross-fertilising? could he be cross-fertilising? could we be cross-fertilising? could you be cross-fertilising? could they be cross-fertilising?
Perfect
could I have cross-fertilised? could you have cross-fertilised? could he have cross-fertilised? could we have cross-fertilised? could you have cross-fertilised? could they have cross-fertilised?
V-ing perfect
could I have been cross-fertilising? could you have been cross-fertilising? could he have been cross-fertilising? could we have been cross-fertilising? could you have been cross-fertilising? could they have been cross-fertilising?
Interro-negative form
Simple form
could I not cross-fertilise? could you not cross-fertilise? could he not cross-fertilise? could we not cross-fertilise? could you not cross-fertilise? could they not cross-fertilise?
V-ing form
could I not be cross-fertilising? could you not be cross-fertilising? could he not be cross-fertilising? could we not be cross-fertilising? could you not be cross-fertilising? could they not be cross-fertilising?
Perfect
could I not have cross-fertilised? could you not have cross-fertilised? could he not have cross-fertilised? could we not have cross-fertilised? could you not have cross-fertilised? could they not have cross-fertilised?
V-ing perfect
could I not have been cross-fertilising? could you not have been cross-fertilising? could he not have been cross-fertilising? could we not have been cross-fertilising? could you not have been cross-fertilising? could they not have been cross-fertilising?