I could harmonise you could harmonise he could harmonise we could harmonise you could harmonise they could harmonise
V-ing form
I could be harmonising you could be harmonising he could be harmonising we could be harmonising you could be harmonising they could be harmonising
Perfect
I could have harmonised you could have harmonised he could have harmonised we could have harmonised you could have harmonised they could have harmonised
V-ing perfect
I could have been harmonising you could have been harmonising he could have been harmonising we could have been harmonising you could have been harmonising they could have been harmonising
Negation
Simple form
I could not harmonise you could not harmonise he could not harmonise we could not harmonise you could not harmonise they could not harmonise
V-ing form
I could not be harmonising you could not be harmonising he could not be harmonising we could not be harmonising you could not be harmonising they could not be harmonising
Perfect
I could not have harmonised you could not have harmonised he could not have harmonised we could not have harmonised you could not have harmonised they could not have harmonised
V-ing perfect
I could not have been harmonising you could not have been harmonising he could not have been harmonising we could not have been harmonising you could not have been harmonising they could not have been harmonising
Interrogative form
Simple form
could I harmonise? could you harmonise? could he harmonise? could we harmonise? could you harmonise? could they harmonise?
V-ing form
could I be harmonising? could you be harmonising? could he be harmonising? could we be harmonising? could you be harmonising? could they be harmonising?
Perfect
could I have harmonised? could you have harmonised? could he have harmonised? could we have harmonised? could you have harmonised? could they have harmonised?
V-ing perfect
could I have been harmonising? could you have been harmonising? could he have been harmonising? could we have been harmonising? could you have been harmonising? could they have been harmonising?
Interro-negative form
Simple form
could I not harmonise? could you not harmonise? could he not harmonise? could we not harmonise? could you not harmonise? could they not harmonise?
V-ing form
could I not be harmonising? could you not be harmonising? could he not be harmonising? could we not be harmonising? could you not be harmonising? could they not be harmonising?
Perfect
could I not have harmonised? could you not have harmonised? could he not have harmonised? could we not have harmonised? could you not have harmonised? could they not have harmonised?
V-ing perfect
could I not have been harmonising? could you not have been harmonising? could he not have been harmonising? could we not have been harmonising? could you not have been harmonising? could they not have been harmonising?