virgoleegoon
1、复杂句(Complex Sentences)，主句+从句。 主句（独立存在）+ 从句（不是句子，不能单独使用） =复杂句 The boy who lived next door went fishing last weeked. Skipping merrily down the road, Sally waved at her friends. Though he was late for class, he walked slowly down the hall. After running a mile, Barry sat down exhausted. He was already full and needed only a glass of water. (不是复杂句)2、复合句（Compoud Sentences），两个主句 + 一个连接词。 John is taking seven classes this semester , so he was no time to play soccer . He was an excellent swimmer , and his friend was a great distance runner. 3、复合复杂句（Compoud Complex Sentences）。复合句+复杂句。 John was a triathlete who trained everyday , but he was still unable to finish the Iron Man Triathon. Though John trained everyday, he was unable to finish the Iron Man Triathon.(不是复合复杂句) When David arrives in the afternoon , we will be able to eat out, but we will not have enough time to go shopping. David, who is arriving this afternoon, will not have enough time to go shopping.(不是复合复杂句)4、逗号拼接谬误（Comma Splice）。用逗号来分离两个主句的时候容易犯错。一般情况下，用 逗号+连接词 ， 分号 或者 句号 其中一个。 Mike studied diligently each night ， he was able to get stright A's.(此处逗号之后没有连接词，此句错误，正确应为 Mike studied diligently each night ，so he was able to get stright A's. ) Though he practiced piano two hourse each day, he still could not master the sonata , it was so difficult. (第二个逗号是错误的，缺少连接词)
xiaoxiao765
复合句（ComplexSentence）分为并列复合句和从属复合句，并列复合句是有并列连词：and、or、but连接；从属复合句由一个主句（PrincipalClause)和一个或一个以上的从句(SubordinateClause)构成。
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复合句英语专四语法总结
复合句——形容词性(定语)从句
1.尤其要注意whose的用法
whose在从句中做定语，修饰名词。所以，如果关系代词后面紧接的是名词，且关系代词又不在从句中做主语或宾语，那么，这个关系代词就应该是whose。如：He is the right person whose personality is well recognized.?
2.介词 + which的用法
如果从句中主宾成分齐全，考生便可考虑关系代词是否在从句中做状语，而状语通常用介词短语充当，于是可以得知，关系代词前面应有介词，再分析所给的'选项，根据与名词的搭配作出正确选择。如：
We are not conscious of the extent to which work provides the psychological satisfaction that can make the difference between a full and an empty life.
3.as 与which用作关系代词的区别
(1)as与the same, such, so, as等关联使用。如：As the forest goes, so goes its animal life.
(2)as和which都可以引导非限定性定语从句，但as在句中的位置比较灵活，可出现在句首、句中、句末，而which只能出现在句末，尤其是当先行词是整个句子时。如：As is true in all institutions, juries are capable of making mistakes.
As is generally accepted, economic growth is determined by the smooth development of production.
常见的这类结构有：as has been said before, as has been mentioned above, as can be imagined, as is known to all, as has been announced, as can be seen from these figures, as might/could be expected, as is often the case, as has been pointed out, as often happens, as will be shown等。
4.关系代词that与which用于引导定语从句的区别
(1)如果关系代词在从句中做宾语，用that, which都可以，而且可以省略；
(2)先行词是不定代词anything, nothing, little, all, everything时，关系代词用that；
(3)先行词由形容词最高级或序数词修饰或由next，last, only, very修饰时，用that；
(4)非限定性定语从句只能用which引导；
(5)关系代词前面如果有介词，只能用which。
5.but做关系代词，用于否定句，相当于who…not, that…not?这个结构的特点是主句中常有否定词或含有否定意义的词。如：
There are few teachers but know how to use a computer.?There is no complicated problem but can be solved by a computer.
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