专题复习--现在进行时
一．意义：
现在进行时是表示现在、说话瞬间或当前一直正在做着的动作. ▲ 二．构成:
be (am, is ,are )+动词现在分词（-ing形式） 三. 动词的现在分词的构成：
（1）一般在动词末尾直接加ing, read→reading; work→working （2）以不发音字母e结尾的动词，先去掉e,再加ing，
如 skate →skating make →making dance → dancing write → writing have → having ride → riding come → coming type→typing
（3）少数几个以ie结尾的动词要变ie为y, 再加-ing die→dying tie→tying lie→lying
★（4）辅+元+辅结构，应双写末尾的辅音字母，再加ing,
如： putting running beginning stopping swimming
shopping jogging sitting getting forgetting letting digging
planning preferring 四、现在进行时的句型转换：
肯定句： 主语 + be + 现在分词V-ing (+ 其他) Eg1. I’m doing my homework now. Eg2. She is singing at the moment.
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Eg3. They are playing computer games now. 否定句：主语+be+not+动词-ing +其他. Eg1. I’m not doing my homework now. Eg2. She isn’t singing at the moment. Eg3. They aren’t playing computer games now. 一般疑问句：Be+主语+动词-ing +其他？ Eg1. Are you doing your home work now?
---Yes, I am. ---No, I’m not. Eg2. Is she singing at the moment?
---Yes, she is. ---No, she isn’t. Eg3. Are they playing computer games now?
---Yes, they are. ---No, they aren’t.
特殊疑问句：特殊疑问词+be+主语+动词-ing+其他？ Eg1. What are you doing now? Eg2. Who is he talking to? Eg3. Where are they dancing? 五、现在进行时的时间标志及用法：
1）一般句中用到表示“在现在”的时间状语，如：now, right now, at the moment 或It’s+几点钟”句型，常判断用现在进行时。 Eg: Let’s go fast. Mr. Wu is waiting for us now/ right now/ at the moment.
Eg. It’s six o’clock. The children are playing basketball. 第2页/共14页
(2)句中用到“Listen！” “Look!” “Keep quiet” “Don’t make noise!”等提示语时，表明说话间另一个动作正在进行，这时，句子也要用现在进行时。
Eg: Keep quiet! The teachers are talking in the office. Eg. Look! They are playing basketball on the playground. Eg. Don’t make noise! The baby is sleeping. Eg. Listen! She is singing in the room. (3)现在进行时常用来表示在当前一直做着的动词，这时句中常用these days ,all the time等时间状语。
Eg: These days, uncle Wang is building a small room for his dog. Eg. Conditions are changing all the time. (4)通过上下文句义，表明某一动作是现在或说话瞬间发生的动作，这个句子也要用现在进行时态。 Eg: --- Is your mother at home?
---Yes, she is .she is watching TV. Eg. ---Where is Tom?
---He is running on the playground.
(5)表示状态和感觉的词，如：know, love, like, look like, want, hear, see, believe, look, smell, taste, feel, sound 一般不能用于进行时态，因为他们不能表示正在进行的动作。 Eg: Look! There are some sheep on the hill. Eg. Look! The boat looks like a duck.
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