I could appraise you could appraise she could appraise we could appraise you could appraise they could appraise
V-ing form
I could be appraising you could be appraising she could be appraising we could be appraising you could be appraising they could be appraising
Perfect
I could have appraised you could have appraised she 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 she could have been appraising we could have been appraising you could have been appraising they could have been appraising
Negation
Simple form
I could not appraise you could not appraise she could not appraise we could not appraise you could not appraise they could not appraise
V-ing form
I could not be appraising you could not be appraising she could not be appraising we could not be appraising you could not be appraising they could not be appraising
Perfect
I could not have appraised you could not have appraised she could not have appraised we could not have appraised you could not have appraised they could not have appraised
V-ing perfect
I could not have been appraising you could not have been appraising she could not have been appraising we could not have been appraising you could not have been appraising they could not have been appraising
Interrogative form
Simple form
could I appraise? could you appraise? could she appraise? could we appraise? could you appraise? could they appraise?
V-ing form
could I be appraising? could you be appraising? could she be appraising? could we be appraising? could you be appraising? could they be appraising?
Perfect
could I have appraised? could you have appraised? could she 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 she have been appraising? could we have been appraising? could you have been appraising? could they have been appraising?
Interro-negative form
Simple form
could I not appraise? could you not appraise? could she not appraise? could we not appraise? could you not appraise? could they not appraise?
V-ing form
could I not be appraising? could you not be appraising? could she not be appraising? could we not be appraising? could you not be appraising? could they not be appraising?
Perfect
could I not have appraised? could you not have appraised? could she not have appraised? could we not have appraised? could you not have appraised? could they not have appraised?
V-ing perfect
could I not have been appraising? could you not have been appraising? could she not have been appraising? could we not have been appraising? could you not have been appraising? could they not have been appraising?