第1个回答 2020-03-09
whether ( 是否)在下列情况下不能用if: 1, whether 引导主语从句并在句首或者引导表语从句,如:Whether he will win the game is not clear. 2, whether 从句中有"or not",如: We don’t know whether he will win or not. (虽然是宾语从句,但有or not,不能用 if。 3, whether 从句作介词宾语时,如:They are talking about whether he will win the game.