雅思作文复杂句怎么写

比如：In the modern world, global warming is one of the most popular topics causing many environmental difficulties and tough challenges arising from its serious consequences.

拆分成四个简单句：

1.Global warming is a common topic these days.

2.Global warming causes environmental problems.

3.There are tough challenges associated with global warming.

4.Global warming has very serious consequences.

什么时候使用复杂句呢？

通常，topic sentence表达要点时，使用简单句，然而在develop观点时，应用复杂句，比如举例子例子论证或解释观点。

如Increasing taxes would raise prices and lower consumption. Fast food companies would pass on these taxes to consumers in the form of higher prices and this would lead to people not being able to afford junk food. For instance, the cost of organic food has proven prohibitively expensive for most people. Despite this, people in many developed countries, where the problem is most acute, can afford price hikes and will continue to eat high-fat meals.

段落中首句为简单句，第二句解释论点并用"and"连接两个简单句使之成为一个复杂句。第三句举例说明， 最后一句用让步状语从句，表明了论证的局限性，把两个想法串联。

怎样使用复杂句呢？

烤鸭们一定要谨记，一个复杂句绝不是只是几个简单句凑成一句话。而是用各种语法结构使之完美连接。一个复杂句是由一个或两个以上的独立从句构成的，并且每个从句都具有完整的语法结构。

例如：“….because the weather was extremely cold.”这是一个原因状语从句，因为它有一个主语和一个动词（严格的说是系动词），但其本身无任何意义，因此，我们需要添加一个独立从句。

也就是说，独立从句本身就有意义的，例如“I wore a warm coat”。如果将两句连起来，就能得到一个复杂句：“I wore a warm coat because the weather was cold.”

方法1：如果两个简单句没有因果关系，基本上是两个独立的事情，往往可以简单地用and相连。

  举例：Children are not sensitive to prices and parents prefer to satisfy their needs.

  方法2：如果两个简单句有一定的因果关系，往往可以用状语从句相连。

  一般来说，if 和when引导条件状语从句(也有一定因果关系，只是不那么强)

  举例：If advertising campaigns directed at children are regulated, children will not pester their parents to buy many goods for them.

  Since, as, because, so等引导原因或者结果状语从句，表示比较强的因果关系

  举例：some children like fast food since they are overwhelmed by fast food advertisements every day.

  方法3：如果状语从句怕重复，可以用and(或者;)+连接词的方式

  有很多连接词because of this, as a result of this, consequently, as a consequence 等，都是表示因果关系。

  举例：some children are addicted to violent video games, and because of this, they can show aggression and bully their peers at school.

  方法4：如果个单句的后一个单词和第二个单句的个单词重复，可以用定语从句连接。

  举例：Children are increasingly temperamental due to their addiction to violent electronic games. These games are normally promoted by advertising firms.

  可以改成：Children are increasingly temperamental due to their addiction to violent electronic games, which are normally promoted by advertising firms.

  方法5：如果第二个单句是个单句的结果，有可能使用非限制性定语从句

  举例：Advertisements have given a lot of information about products. This enables parents to make well-informed buying decisions.

  可以改成：Advertisements have given a lot of information about products, which can help parents to make well-informed buying decisions.

  简而言之，不要嫌弃简单句，简单句写熟了，复杂句很容易写。