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