5. The flowers smell sweet. 那些花闻起来很香 。
难点四、现在进行时
表示现在正在进行的动作 。
–What are you doing now?
–I'm reading a book.
–你在干什么？
–我正在读一本书 。
1. 构成： 主语＋be 动词（am/is/are）＋动词的现在分词＋其它成分
We are having lunch. He is reading a book. The dog is running after a cat.
The boys are swimming across the river.
2. 疑问句: 将be 动词移到句首
Are we having lunch? Is he reading a book? Is the dog running after a cat? Are the boys swimming across the river?
3. 否定句:在be 动词后面加not
We are not having lunch. He is not reading a book. The dog is not running after a cat.The boys are swimming across the river.
4. 特殊疑问句：what, which, how, where, who, etc.
疑问词＋动词＋主语＋现在分词
What are you doing? What is she doing? What is the dog doing?
难点五、现在分词的构成
（1）一般动词加-ing 如：
look-looking, read-reading, play-playing
（2）以不发音的字母结尾的单词去e 加-ing 如：
make-making, take-taking, arrive-arriving
（3）重读闭音节词结尾，即单词中只有一个元音字母 ， 其后紧跟一个辅音字母的词，双写辅音字 母再加-ing 如：
run-running, sit-sitting, get-getting, swim-swimming, stop–stopping
规则四：以ie 结尾的动词 ， 把ie 改为y, 再加ing 。如： tie-tying, die-dying
难点六、Here is /are … 这儿有……
该句为倒装句，真正的主语is/are 后面的部分 。is 后接单数：are 后接复数 。
Here is your book. 这是你的书 。
Here are your books. 这是你们的书 。
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