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since的八种用法详解

2025-09-02 03:44:26

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since的八种用法详解,在线等,很急,求回复!

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2025-09-02 03:44:26

since的八种用法详解】“since” 是英语中非常常见且灵活的一个词,既可以作为连词,也可以作为介词或副词使用。掌握它的不同用法,有助于更准确地理解和运用英语。下面将从八个方面对“since”的用法进行详细讲解,并通过表格形式进行总结。

一、表示“自从……以来”(时间状语)

用法说明:

“since + 时间点”表示从某个具体的时间点开始一直持续到现在。

例句:

- I have lived here since 2015.

- She has been working at the company since last year.

二、引导现在完成时的状语从句

用法说明:

“since + 一般过去时”常与现在完成时连用,表示动作从过去某一时间开始,一直持续到现在。

例句:

- He has studied English since he was a child.

- They have known each other since they met in college.

三、表示“因为,由于”(原因状语)

用法说明:

“since”可以引导原因状语从句,相当于“because”,但语气较正式。

例句:

- Since it is raining, we will stay indoors.

- Since you are tired, you should rest now.

四、表示“既然,考虑到”(让步或条件)

用法说明:

“since”也可用于表达一种让步或条件,意为“既然……就……”。

例句:

- Since you’re not coming, I’ll go alone.

- Since it’s your birthday, let’s celebrate tonight.

五、作介词,表示“自……以来”

用法说明:

“since”作为介词时,后面接时间点,表示从某一点开始。

例句:

- He has been absent since Monday.

- The meeting started since 9 a.m.

六、作副词,表示“从那时起”

用法说明:

“since”作副词时,通常放在句尾,表示“从那以后”。

例句:

- I saw her last week, and since then I haven’t heard from her.

- He left the company two years ago, and since then he has been working elsewhere.

七、表示“尽管,虽然”(在某些固定搭配中)

用法说明:

在一些固定表达中,“since”可表示“尽管”,但这种用法较少见,多出现在文学或正式语境中。

例句:

- Since he is young, he may not understand.(此句中“since”更偏向于“因为”)

- Since she was tired, she went to bed early.(同样更偏向“因为”)

八、在“it is/has been + 一段时间 + since + 过去时”结构中

用法说明:

这是“since”最常用的句型之一,用来表示“自……以来已经多久了”。

例句:

- It has been two years since we last met.

- It is three days since the storm passed.

总结表格:

序号 用法类型 结构示例 说明
1 表示“自从……以来” I have lived here since 2015 强调时间起点
2 现在完成时状语 He has studied English since he was a child 与现在完成时连用
3 表示“因为” Since it is raining, we will stay indoors 相当于“because”,语气正式
4 表示“既然” Since you’re not coming, I’ll go alone 表达让步或条件
5 介词用法 He has been absent since Monday 后接时间点
6 副词用法 I saw her last week, and since then... 放在句尾,表示“从那以后”
7 表示“尽管” Since he is young, he may not understand 较少使用,多见于正式语境
8 “it is/has been + 一段时间 + since + 过去时” It has been two years since we last met 表示“自……以来已经多久了”

通过以上八种用法的学习和练习,可以更全面地掌握“since”在不同语境中的使用方式,提高英语表达的准确性与灵活性。

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