I could aprise you could aprise he could aprise we could aprise you could aprise they could aprise
V-ing form
I could be aprising you could be aprising he could be aprising we could be aprising you could be aprising they could be aprising
Perfect
I could have aprised you could have aprised he 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 he 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 he 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 he 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 he 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 he 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 he aprise? could we aprise? could you aprise? could they aprise?
V-ing form
could I be aprising? could you be aprising? could he be aprising? could we be aprising? could you be aprising? could they be aprising?
Perfect
could I have aprised? could you have aprised? could he 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 he 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 he 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 he 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 he 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 he have been aprising? couldn't we have been aprising? couldn't you have been aprising? couldn't they have been aprising?