он не знал, как поступил бы, если б

он не знал, как поступил бы, если бы он был на моем месте

Результаты (английский) 1:

He did not know how would have acted if he were in my place

Результаты (английский) 2:

He did not know what would do if he were in my shoes

Результаты (английский) 3:

he did not know how i would do if he were in my place