I could deduce you could deduce she could deduce we could deduce you could deduce they could deduce
V-ing form
I could be deducing you could be deducing she could be deducing we could be deducing you could be deducing they could be deducing
Perfect
I could have deduced you could have deduced she could have deduced we could have deduced you could have deduced they could have deduced
V-ing perfect
I could have been deducing you could have been deducing she could have been deducing we could have been deducing you could have been deducing they could have been deducing
Negation
Simple form
I could not deduce you could not deduce she could not deduce we could not deduce you could not deduce they could not deduce
V-ing form
I could not be deducing you could not be deducing she could not be deducing we could not be deducing you could not be deducing they could not be deducing
Perfect
I could not have deduced you could not have deduced she could not have deduced we could not have deduced you could not have deduced they could not have deduced
V-ing perfect
I could not have been deducing you could not have been deducing she could not have been deducing we could not have been deducing you could not have been deducing they could not have been deducing
Interrogative form
Simple form
could I deduce? could you deduce? could she deduce? could we deduce? could you deduce? could they deduce?
V-ing form
could I be deducing? could you be deducing? could she be deducing? could we be deducing? could you be deducing? could they be deducing?
Perfect
could I have deduced? could you have deduced? could she have deduced? could we have deduced? could you have deduced? could they have deduced?
V-ing perfect
could I have been deducing? could you have been deducing? could she have been deducing? could we have been deducing? could you have been deducing? could they have been deducing?
Interro-negative form
Simple form
could I not deduce? could you not deduce? could she not deduce? could we not deduce? could you not deduce? could they not deduce?
V-ing form
could I not be deducing? could you not be deducing? could she not be deducing? could we not be deducing? could you not be deducing? could they not be deducing?
Perfect
could I not have deduced? could you not have deduced? could she not have deduced? could we not have deduced? could you not have deduced? could they not have deduced?
V-ing perfect
could I not have been deducing? could you not have been deducing? could she not have been deducing? could we not have been deducing? could you not have been deducing? could they not have been deducing?