если бы он играл свою роль плохо он

если бы он играл свою роль плохо она догадалась бы что ее обманывают

Results (English) 1:

if he had played his part badly she would have realized that it deceived

Results (English) 2:

if he played his role badly she would have guessed that she was being deceived

Results (English) 3:

If he plays his part, she doesn't know she's being cheated.