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廣州新東方酷學(xué)酷玩夏令營：

      當(dāng)句子的主語是動作的執(zhí)行者時(shí)，謂語的形式叫主動語態(tài)。當(dāng)句子的主語是動作的承受者時(shí)，謂語的形式叫被動語態(tài)。被動語態(tài)由助動詞be +過去分詞構(gòu)成，時(shí)態(tài)通過 be 表現(xiàn)出來。例如：

1 一般現(xiàn)在時(shí)：you are required to do this.
2 一般過去時(shí)：the window was broken by xiao ming.
3 一般將來時(shí)：the problem will be discussed tomorrow.
4 現(xiàn)在進(jìn)行時(shí)：the road is being widened.
5 過去進(jìn)行時(shí)：the new tool was being made.
6 現(xiàn)在完成時(shí)：the door has been painted.
7 過去完成時(shí)：he said that the work had been finished.
8 過去將來時(shí)：he said that the trees would be planted.

廣州酷學(xué)酷玩 tbmh.com.cn/gzxdf/