даже если бы ему ничего не сказали,

даже если бы ему ничего не сказали, он бы догадался в чем дело

Результаты (английский) 1:

even if he had said nothing, he would have guessed what was wrong

Результаты (английский) 2:

even if he did not say anything, he would have guessed what was going on

Результаты (английский) 3:

even if he didn"t say anything, he would know what it is