I could scare you could scare he could scare we could scare you could scare they could scare
V-ing form
I could be scaring you could be scaring he could be scaring we could be scaring you could be scaring they could be scaring
Perfect
I could have scared you could have scared he could have scared we could have scared you could have scared they could have scared
V-ing perfect
I could have been scaring you could have been scaring he could have been scaring we could have been scaring you could have been scaring they could have been scaring
Negation
Simple form
I could not scare you could not scare he could not scare we could not scare you could not scare they could not scare
V-ing form
I could not be scaring you could not be scaring he could not be scaring we could not be scaring you could not be scaring they could not be scaring
Perfect
I could not have scared you could not have scared he could not have scared we could not have scared you could not have scared they could not have scared
V-ing perfect
I could not have been scaring you could not have been scaring he could not have been scaring we could not have been scaring you could not have been scaring they could not have been scaring
Interrogative form
Simple form
could I scare? could you scare? could he scare? could we scare? could you scare? could they scare?
V-ing form
could I be scaring? could you be scaring? could he be scaring? could we be scaring? could you be scaring? could they be scaring?
Perfect
could I have scared? could you have scared? could he have scared? could we have scared? could you have scared? could they have scared?
V-ing perfect
could I have been scaring? could you have been scaring? could he have been scaring? could we have been scaring? could you have been scaring? could they have been scaring?
Interro-negative form
Simple form
could I not scare? could you not scare? could he not scare? could we not scare? could you not scare? could they not scare?
V-ing form
could I not be scaring? could you not be scaring? could he not be scaring? could we not be scaring? could you not be scaring? could they not be scaring?
Perfect
could I not have scared? could you not have scared? could he not have scared? could we not have scared? could you not have scared? could they not have scared?
V-ing perfect
could I not have been scaring? could you not have been scaring? could he not have been scaring? could we not have been scaring? could you not have been scaring? could they not have been scaring?