I could avert you could avert she could avert we could avert you could avert they could avert
V-ing form
I could be averting you could be averting she could be averting we could be averting you could be averting they could be averting
Perfect
I could have averted you could have averted she could have averted we could have averted you could have averted they could have averted
V-ing perfect
I could have been averting you could have been averting she could have been averting we could have been averting you could have been averting they could have been averting
Negation
Simple form
I couldn't avert you couldn't avert she couldn't avert we couldn't avert you couldn't avert they couldn't avert
V-ing form
I couldn't be averting you couldn't be averting she couldn't be averting we couldn't be averting you couldn't be averting they couldn't be averting
Perfect
I couldn't have averted you couldn't have averted she couldn't have averted we couldn't have averted you couldn't have averted they couldn't have averted
V-ing perfect
I couldn't have been averting you couldn't have been averting she couldn't have been averting we couldn't have been averting you couldn't have been averting they couldn't have been averting
Interrogative form
Simple form
could I avert? could you avert? could she avert? could we avert? could you avert? could they avert?
V-ing form
could I be averting? could you be averting? could she be averting? could we be averting? could you be averting? could they be averting?
Perfect
could I have averted? could you have averted? could she have averted? could we have averted? could you have averted? could they have averted?
V-ing perfect
could I have been averting? could you have been averting? could she have been averting? could we have been averting? could you have been averting? could they have been averting?
Interro-negative form
Simple form
couldn't I avert? couldn't you avert? couldn't she avert? couldn't we avert? couldn't you avert? couldn't they avert?
V-ing form
couldn't I be averting? couldn't you be averting? couldn't she be averting? couldn't we be averting? couldn't you be averting? couldn't they be averting?
Perfect
couldn't I have averted? couldn't you have averted? couldn't she have averted? couldn't we have averted? couldn't you have averted? couldn't they have averted?
V-ing perfect
couldn't I have been averting? couldn't you have been averting? couldn't she have been averting? couldn't we have been averting? couldn't you have been averting? couldn't they have been averting?