I could admire you could admire he could admire we could admire you could admire they could admire
V-ing form
I could be admiring you could be admiring he could be admiring we could be admiring you could be admiring they could be admiring
Perfect
I could have admired you could have admired he could have admired we could have admired you could have admired they could have admired
V-ing perfect
I could have been admiring you could have been admiring he could have been admiring we could have been admiring you could have been admiring they could have been admiring
Negation
Simple form
I could not admire you could not admire he could not admire we could not admire you could not admire they could not admire
V-ing form
I could not be admiring you could not be admiring he could not be admiring we could not be admiring you could not be admiring they could not be admiring
Perfect
I could not have admired you could not have admired he could not have admired we could not have admired you could not have admired they could not have admired
V-ing perfect
I could not have been admiring you could not have been admiring he could not have been admiring we could not have been admiring you could not have been admiring they could not have been admiring
Interrogative form
Simple form
could I admire? could you admire? could he admire? could we admire? could you admire? could they admire?
V-ing form
could I be admiring? could you be admiring? could he be admiring? could we be admiring? could you be admiring? could they be admiring?
Perfect
could I have admired? could you have admired? could he have admired? could we have admired? could you have admired? could they have admired?
V-ing perfect
could I have been admiring? could you have been admiring? could he have been admiring? could we have been admiring? could you have been admiring? could they have been admiring?
Interro-negative form
Simple form
could I not admire? could you not admire? could he not admire? could we not admire? could you not admire? could they not admire?
V-ing form
could I not be admiring? could you not be admiring? could he not be admiring? could we not be admiring? could you not be admiring? could they not be admiring?
Perfect
could I not have admired? could you not have admired? could he not have admired? could we not have admired? could you not have admired? could they not have admired?
V-ing perfect
could I not have been admiring? could you not have been admiring? could he not have been admiring? could we not have been admiring? could you not have been admiring? could they not have been admiring?