1. 表示以前没有某物的句型

　　There was no + 单数名词或不可数名词 + 过去时间。There was no library in my old school.

　　There were no + 复数名词 + 过去时间。There were no computers or Internet in my time.

　　注意： no+ 名词相当于not a / an / any + 名词。 There weren’t any computer rooms at all. There was no gym ,either.

　　2. 表示不喜欢的句型

　　I didn’t like + 名词或动名词。如：

　　Before I didn’t like dogs. Before I didn’t like beef. Before I didn’t like going running.

　　3. 表示过去不能做或不会做的句型

　　I couldn’t + 动词原形。 I couldn’t go cycling before. People couldn’t use the Internet in the Tang dynasty.

　　4. 如何描述某人过去和现在的不同情况

　　① 外貌和性格：Before, 主语+was / were +形容词. Now，主语+am / is / are +形容词.

　　Before I wasn’t tall. I was quiet. Now I am tall. I am active.

　　Before she had short hair. Now she has long hair.

　　Before he didn’t wear glasses. Now he wears glasses.

　　②能力方面：Before, 主语+couldn’t +动词原形. Now, 主语+can +动词原形.

　　Before I couldn’t swim. Now I can swim very well.

　　③爱好方面：Before, 主语+didn’t like +名词 / 动词ing. Now, 主语+like +名词 /动词ing.

　　Before he didn’t like reading books. Now he likes reading books.

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