请问英语高手 请问英语高手
\u82f1\u8bed\u9ad8\u624b\uff01\uff01\u5e94\u8be5\u662f\u4f5c\u7684\u5bbe\u8bed
\u8fd9\u91cc\u628a\u4ecb\u8bcd\u77ed\u8bedinto the bus \u63d0\u5230\u53e5\u9996 \u662f\u4e3a\u4e86\u52a0\u5f3a\u53e5\u5b50\u7684\u8bed\u6c14\uff0c \u5f3a\u8c03\u8fd9\u4e00\u90e8\u5206\uff0c\u53e5\u5b50\u7528\u5012\u88c5\u53e5\u3002
be sure to do \u8868\u793a\u8bf4\u8bdd\u4eba\u6709\u628a\u63e1\u67d0\u4e8b\u4f1a\u53d1\u751f\u3002
must \u8868\u793a\u4e00\u5b9a\u65f6\u662f\u8868\u793a\u80af\u5b9a\u7684\u63a8\u6d4b \u3002
eg . He is sure to come . \u8fd9\u91cc\u8868\u793aI am sure that he will come . \uff08\u8868\u793a\u8bf4\u8bdd\u4eba\u7684\u6001\u5ea6\uff09
He must be in the room . \u8fd9\u91cc\u662fI think that he is in the room . \uff08 \u8868\u793a\u8bf4\u8bdd\u4eba\u7684\u4e3b\u89c2\u63a8\u65ad\uff09
many tourists would like to spend a day before leaving beijing visiting two very famous sites.请问leave visit 为什么都用ing形式 为什么
句中的 spend a day (in) doing sth/ visiting two very famous sites.是一个固定短语，意思是：“花费。。。时间做某事”。
句中的before在此是介词，后面接名词或动名词，句中的 leaving beijing 是动名词短语，做介词before 的宾语。
1，spend time/money/...+doing sth，这是一个固定用法，表示花费时间/金钱等等去做某事，
这里句子主体是many tourists would like to spend a day visiting two very famous sites.许多游客愿意花两天时间参观一下有名的景点,
2，before leaving Beijing 是一个介词短语，作用相当一个时间状语从句=before they leave beijing ，因为是介词，后面的动词要用动名词形式。类似的用法很多，如 we are talk about palying the game。 I am good at drawing。
3，一句话总结：介词后面加动词，一定要是动名词形式，用来做介词的宾语。
before leaving beijing 是动名词作介词宾语 介词短语作状语 visiting 与before无关
visiting two very famous sites是 spend time doing sth 句型
before 后面接leaving是因为介词短语后面应当用动名词形式，指的是离开北京这么个情况；
后面那个visiting是因为接在spend后面的动词，是本句的第二个动词应当用ing形式，而且本身也有spend ...doing sth 这么个短语形式。
leave beijing是做了介词before的宾语，所以使用的是动名词leaving，表示离开北京这件事。
visit two very famous sites是整个句子的目的状语，所以使用的是现在分词visiting，表示逛几个景点这个目的（它前面没有介词）。
虽然他们都是ing形式，但是具体的含义不一样。
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绛旓細past master;master-hand;ace;High hand;master hand,expert 閮芥湁杩欐剰鎬
