1)我們不知道或沒有必要說明動作的執(zhí)行者是誰的時候(這時不帶by引起的短語)。
Printing was introducedsintosEurope from China. Look! There is nothing here. Everything has been taken away.
2)當我們強調(diào)或興趣在動作的承受者時(這時可帶by引起的短語)。
The song was composed by a student. A good time was had by all.
3)當我們出于禮貌、措辭圓通等方面的考慮不愿說出動作的執(zhí)行者是誰時。
You are requested to give a performance. You are cordially invited to a party to be given at the Teachers' Club at 3 p.m. Nov. 23.
4)當出于行文的需要，被動結(jié)構(gòu)更容易安排句子時。
They are going to build an apartment house here next year. It is going to be built right beside the Office Building. The plan was especially supported by those who wished to have more chance to speak English.
Printing was introducedsintosEurope from China. Look! There is nothing here. Everything has been taken away.
2)當我們強調(diào)或興趣在動作的承受者時(這時可帶by引起的短語)。
The song was composed by a student. A good time was had by all.
3)當我們出于禮貌、措辭圓通等方面的考慮不愿說出動作的執(zhí)行者是誰時。
You are requested to give a performance. You are cordially invited to a party to be given at the Teachers' Club at 3 p.m. Nov. 23.
4)當出于行文的需要，被動結(jié)構(gòu)更容易安排句子時。
They are going to build an apartment house here next year. It is going to be built right beside the Office Building. The plan was especially supported by those who wished to have more chance to speak English.