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