Если бы он не был болен тогда, он м

Если бы он не был болен тогда, он мог бы оказаться в гораздо большей опасности.

Results (English) 1:

If he had not been sick, then he would be in much greater danger.

Results (English) 2:

If he was not sick then, he could be in much greater danger.

Results (English) 3:

If he had not been a very sick at that time, it could not be in much greater danger.