Then是什么意思？详解then的定义、用法和常见句型
Then是一个常见的英语单词，它可以用作副词、形容词、名词、连词等。作为副词，它通常表示时间、顺序或结果，也可以用作条件或推断。作为形容词，它表示那时的、当时的。作为名词，它表示那时、当时。作为连词，它表示结果、因此、然后等。
下面我们将详细介绍then的定义、用法和常见句型。
一、then的定义
1. 时间副词
Then作为时间副词，表示在过去或未来某个时间点之后，或在某个事件之后。例如：
- I will meet you at the park at 3 o'clock, then we can go to the cinema.
- He finished his homework, then he went to bed.
2. 顺序副词
Then作为顺序副词，表示某个事件或行动的顺序。例如：
- First, we need to buy the ingredients, then we can start cooking.
- He brushed his teeth, then he took a shower.
3. 结果副词
Then作为结果副词，表示某个事件或行动的结果。例如：
- If you study hard, then you will pass the exam.
- He worked hard, then he got promoted.
4. 条件副词
Then作为条件副词，表示某个事件或行动的条件。例如：
- If it rains, then we will stay at home.
- If you finish your work, then you can go out and play.
5. 推断副词
Then作为推断副词，表示某个事件或行动的推断。例如：
- He didn't come to the party, then he must be busy.
- She didn't answer the phone, then she must be sleeping.
6. 形容词
Then作为形容词，表示那时的、当时的。例如：
- The then president of the company was a very successful businessman.
- The then prime minister resigned due to a scandal.
7. 名词
Then作为名词，表示那时、当时。例如：
- Back then, life was much simpler.
- I remember the excitement of the then upcoming concert.
8. 连词
Then作为连词，表示结果、因此、然后等。例如：
- He didn't finish his work, then he couldn't go out.
- She studied hard, then she passed the test.
二、then的用法
1. 用于时间状语从句
Then常用于时间状语从句中，表示在某个时间点之后。例如：
- I will finish my work, then I will go to the gym.
- He will arrive at the airport at 8am, then he will take a taxi to the hotel.
2. 用于条件状语从句
Then常用于条件状语从句中，表示某个事件或行动的条件。例如：
- If you finish your work, then you can go out and play.
- If it rains, then we will stay at home.
3. 用于结果状语从句
Then常用于结果状语从句中，表示某个事件或行动的结果。例如：
- If you study hard, then you will pass the exam.
- He worked hard, then he got promoted.
4. 用于连词
Then常用于连词中，表示结果、因此、然后等。例如：
- He didn't finish his work, then he couldn't go out.
- She studied hard, then she passed the test.
5. 用于强调
Then有时也用于强调，表示某个事件或行动的重要性。例如：
- It was then that I realized the importance of education.
- He then decided to quit his job and start his own business.
三、then的常见句型
1. if...then...
if...then...是一个常见的句型，表示条件和结果之间的关系。例如：
- If you study hard, then you will pass the exam.
- If it rains, then we will stay at home.
2. first...then...
first...then...是一个常见的句型，表示顺序和结果之间的关系。例如：
- First, we need to buy the ingredients, then we can start cooking.
- He brushed his teeth, then he took a shower.
3. back then
back then表示过去的某个时期或时代。例如：
- Back then, life was much simpler.
- Back then, people used to communicate by letter.
4. since then
since then表示从那时起一直到现在。例如：
- He has been working at the company since then.
- She has been living in the city since then.
5. until then
until then表示在某个时间点之前。例如：
- I had never been to Europe until then.
- He had never tasted sushi until then.
6. by then
by then表示在某个时间点之前完成某个事件或行动。例如：
- I will finish my work by then.
- He will arrive at the airport by then.
四、then的注意事项
1. then不应该与than混淆。than是一个比较级连词，表示比较。
2. then在句子中的位置不固定，但通常放在时间状语从句、条件状语从句、结果状语从句、顺序副词或形容词后面。
3. then在句子中有时可以省略，但是省略后可能会使句子不够清晰。
4. then有时也可以用作形容词或名词，但这种用法比较少见。
总之，then是一个非常常见的单词，具有多种含义和用法。只有通过不断的学习和实践，我们才能更好地掌握它的用法和意义。
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