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1. 双元音[iə] 由[i]和[ə]两个单⾳音组成，[i]重读，[ə]轻读，双唇始

终半开。

字母组合ea—area, idea, real, theater

字母组合ear—ear, dear, hear, clear, fear, near, tear, beard

字母组合ere—here, mere, severe

字母组合eer—beer, deer, engineer, pioneer, volunteer 

2. 双元⾳音[uə] 由[u]和[ə]两个单⾳音组成，[u]重读，[ə]轻读，双唇

由收圆到半开。

字母组合ua—actually, February, casual, January, usually

字母组合oor—poor 

字母组合our—tour, tourist, tourism

字母组合ure—cure, pure, sure

常英语部分：

1.  现在进行时的变化

肯定句： 主语+be动词（am/is/are）+现在分词（动词ing）+其他

         He is going to his work. (他正在去上班。

否定句： 主语+be动词（am/is/are）+not+现在分词（动词ing）+其他

         She is not going to Hong Kong tomorrow.(他明天不去香港。)

一般疑问句： Be动词（am/is/are）+主语+现在分词（动词ing）+其他

             Are they all playing computer games? (他们都在玩电脑游戏吗吗？)

特殊疑问句：疑问词+be动词（am/is/are）+主语+现在分词+其他？

           What are they doing now? (他们现在在干什么？)

           Why are they arguing? (他们为什么争吵？)

           How is he going to Korean without passport? (没有护照他什么去韩国呢？)

2.  表示渐变的动词可以用现在进行时：

常见表示渐变的动词有：get, grow, become, turn, run, go, begin 

The trees are getting yellow. 树渐渐变黄了。

The boy is getting taller. 这个男孩在长高。

We are becoming friends. 我们慢慢变成朋友。

The car is turning to another direction. 汽车正转向另一个方向。

We are running out of the water. 我们要用完水了。

The apple is going bad. 这个苹果在变坏。

The leaves are beginning to fall. 树叶开始掉落。