1、1英语基本句式1. 主系表结构表语有三种情况，名词（短语） ，形容词（短语） ，介词（短语） ；系动词(即 be 动词)是“灵魂” ，因为人称、单复数、疑问否定都体现在 be 动词的变化上。Examples:I am a teacher now. They were in Australia ten years ago. Mr. Smith is very kind.Is Mr. Smith very kind? Mr. Smith isnt (is not) very kind. They will be husband and wife next month.Will they be hu
2、sband and wife next month?They wont (will not) be husband and wife next year.I have been here for ten years.2. 主谓（宾）结构当谓语动词是及物动词时，构成主谓宾结构；当谓语动词是不及物动词时，够成主谓结构。在这种结构中，普通的实义动词(也就是谓语动词)是“灵魂” ，因为它体现了人称、单复数和时态的变化，但它并不能独立完成否定和疑问， 必须借助助动词。( 我们已经学过的助动词有 do/does, did, have/has, will)Examples:I have bread and
3、eggs for breakfast. (主谓宾结构) (have 是及物动词，bread and eggs 是宾语)He usually swims for two hours a day. (主谓结构)(swim 是不及物动词)The students spend half an hour reading in the morning.Do the students spend half an hour reading in the morning?The students dont (do not) spend half an hour reading in the morning.He
4、 worked in a factory last year.Did he work in a factory last year?He didnt work in a factory last year.We have finished our task.Have you finished your task?We havent (have not) finished our task.He will go abroad next year.Will he go abroad next year?He wont (will not) go abroad next year.3. there
5、be 结构be 动词是“灵魂” ，因为它体现句子的人称、单复数、疑问和否定。Examples:There is a book on the desk.Is there a book on the desk?There isnt (is not) a book on the desk.2There are two pens in the box.There was a dog under the tree.Was there a dog under the tree?There wasnt (was not) a dog under the tree.There will be a meetin
6、g this Saturday.There wont (will not) be a meeting this Saturday. Wont There have been plenty of problems.There havent been plenty of problems.总结：这一讲主要告诉大家，无论句子有多长多复杂，它总是属于这三种基本句式中的一种，遇到长句难句时，通过划分句子成分，你就很容易找到句子的主干并理解句子的意思了。另一点需要大家注意的是句子成分问题，大家知道，英语中主要有以下句子成分，比如：主语，谓语，宾语，定语，状语，补语，表语，等等。在简单的句子中，这些成分只要用一个单词或词组就能表示了，但在较复杂的句子中，单词或词组不足以把意义表达完全，所以要用一个句子来做相应的句子成分，这样一来，我们就有了相应的从句：用来做主语的句子叫主语从句，做宾语的句子叫宾语从句，做定语的句子叫定语从句，等等。 （注意：英语中，谓语一般是一个动词或动词词组，没有谓语从句。）
