主将从现 I‘ll visit you if it doesn‘t rain tomorrow. Use your head, and you‘ll find a way.
Unless you work hard, you‘ll get a good job. If the traffic lights are green, you can cross the street. 宾语从句
一、宾语从句的语态。
宾语从句要用陈述语态
--- Do you know ______ for Shanghai last night? A. what time he leaves B. what time did he leave C. what time he left. 二、主句与从句时态一致。
1、如果主句用现在的某个时态，宾语从句视实际情况而定。 I wonder if you can help me. 我想知道你是否能帮我。 2、主过--- 从过
He told me that he would take part in English club. 他告诉我他将参加英语俱乐部。 He asked me if I used his bike. 他问我是否我用过他的自行车。
如果是客观事实，宾语从句用一般现在时。 Jim told me that the earth is round. Jim告诉我地球是圆的。 三、连接词
1、that可省略，that作主语时不能省。 2、what , which , who, whose, whom He asked me whose the book is. 3、when, how, where, why
Could you tell me where the restaurant is. Do you know how to get to the bank? if / whether 是否
以下情况只能用 whether :
与or not 连用 Can you tell me whether we go or not.
作介词后的宾语从句 I‘m worried about whether we should study each other, 跟不定式to do Have you decided whether to go with us. 定语从句的用法
定语从句中只能使用that的情况
1.当先行词为anything，everything，nothing等不定代词时，只能使用―that‖。 例：Is there anything that I can do for you?(我能给你做点什么吗？) 2.当先行词为all，any，much，many词时，只能使用―that‖。
例：Tom told her mother all that had happened.(汤姆把事情的全部情况告诉了他的妈妈。) 3.当先行词是形容词最高级或被形容词最高级修饰时，只能使用―that‖。
例：This is the most wonderful time that I have ever had. (这是我度过的最美好的时光。) 4.当先行词是序数词修饰时，只能使用―that‖。例：
He was the first person that passed the exam.他是第一个通过考试的人。
5.先行词被the only，the very，the same，the last修饰时，只能使用―that‖。例：This will be the last chance that he can get.(这将会是他得到的唯一机会。) He is the only person that can help you out.(他是唯一能帮你的人。)
6.先行词里同时含有人或物时，只能使用―that‖。
例：They talked of things and persons that they remembered in the school.(他们谈论他们记得的有关学校的事和人。)
7.当主句是以who，which开头的特殊疑问句或先行词是who时，只能使用―that‖。
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例：Which is the book that he bought from the library yesterday?(哪本是你们昨天从图书馆借的书？)
注意：●指物时，在介词后只能用which，而不能用that. ●定词从句修饰代表地点、时间的先行词时,要看代表先行词的关系词在定语从句中是否作谓语动词的宾语.如作动词的宾语,就要用关系代词that 或which引导定语从句.反之,要用关系副词 where（表地点）或 when（表时间）,在定语从句中作状语.
如:Mary would never forget the evening when she lost the book. I‘ve been to the city that you visited last week. 被动语态注意事项 ●构成
被动语态表明一个被动性动作，它由―助动词be＋及物动词的过去分词‖构成。 一般现在时 am/is/are + pp. 一般过去时 was /were + pp.
一般将来时 will be + pp. am/is/are going to be+ pp. 情态动词 may/ can/ must/ should be + pp. 被动语态否定式为be not + pp.，
情态动词被动语态否定式为情态动词＋not be + pp..
●主动语态变为被动语态时，通常将主动语态中的宾语变为被动语态的主语；主动语态的主语变为由介词by引导的宾语；谓语动词变为被动语态―be +过去分词‖形式，例如：
Everyone likes the interesting film. (主动语态) → The interesting film is liked by everyone. (被动语态)
They used knives to cut things. (主动语态) → Knives are used to cut things. (被动语态)
●某些动词可以跟双宾语如give、pass、bring、write；buy、make等，在变为被动语态时如果直接宾语变为被动语态中的主语，则间接宾语通常由介词to、for引出。例如：
My sister gave me a nice watch for my birthday.→A nice watch was given to me by my sister for my birthday.我过生日时收到了姐姐的一块手表。
They have bought us many books. → Many books have been bought for us by them. 很多书都是由他们给我们买的。
●某些动词make、hear、see、watch等在主动语态中，其宾语补足语要求用不带to的不定式。但在变为被动语态时通常省略的不定式符号to必须恢复。如：He made us clean the classroom after school.→We were made to clean the classroom after school. 我们被迫在放学后打扫教室。 I saw him come into the room. → He was seen to come into the room. 人们看见他进了屋子。 ●在主动语态中如果谓语动词是含有介词或副词的短语动词，变为被动语态时不能丢掉该介词或副词。如：
They must take good care of the children. → The children must be taken good care of. 孩子们必须小心照看。
●英语中某些动词如sell、lock、draw、smell、touch、feel、sounds、write、be worth doing、sth. needs doing等可以用主动表示被动意义。如：This kind of books sells well. 这种书畅销。 The door won‘t lock. 门锁不上。
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