I could appraise you could appraise he could appraise we could appraise you could appraise they could appraise
V-ing form
I could be appraising you could be appraising he could be appraising we could be appraising you could be appraising they could be appraising
Perfect
I could have appraised you could have appraised he could have appraised we could have appraised you could have appraised they could have appraised
V-ing perfect
I could have been appraising you could have been appraising he could have been appraising we could have been appraising you could have been appraising they could have been appraising
Negation
Simple form
I couldn't appraise you couldn't appraise he couldn't appraise we couldn't appraise you couldn't appraise they couldn't appraise
V-ing form
I couldn't be appraising you couldn't be appraising he couldn't be appraising we couldn't be appraising you couldn't be appraising they couldn't be appraising
Perfect
I couldn't have appraised you couldn't have appraised he couldn't have appraised we couldn't have appraised you couldn't have appraised they couldn't have appraised
V-ing perfect
I couldn't have been appraising you couldn't have been appraising he couldn't have been appraising we couldn't have been appraising you couldn't have been appraising they couldn't have been appraising
Interrogative form
Simple form
could I appraise? could you appraise? could he appraise? could we appraise? could you appraise? could they appraise?
V-ing form
could I be appraising? could you be appraising? could he be appraising? could we be appraising? could you be appraising? could they be appraising?
Perfect
could I have appraised? could you have appraised? could he have appraised? could we have appraised? could you have appraised? could they have appraised?
V-ing perfect
could I have been appraising? could you have been appraising? could he have been appraising? could we have been appraising? could you have been appraising? could they have been appraising?
Interro-negative form
Simple form
couldn't I appraise? couldn't you appraise? couldn't he appraise? couldn't we appraise? couldn't you appraise? couldn't they appraise?
V-ing form
couldn't I be appraising? couldn't you be appraising? couldn't he be appraising? couldn't we be appraising? couldn't you be appraising? couldn't they be appraising?
Perfect
couldn't I have appraised? couldn't you have appraised? couldn't he have appraised? couldn't we have appraised? couldn't you have appraised? couldn't they have appraised?
V-ing perfect
couldn't I have been appraising? couldn't you have been appraising? couldn't he have been appraising? couldn't we have been appraising? couldn't you have been appraising? couldn't they have been appraising?