本文目录
一般现在完成时是英语中常用的一种时态,它用于描述已经完成的动作或状态与现在的联系。这种时态由助动词“have/has”加上过去分词构成。
构成
一般现在完成时的构成方式为:主语 + have/has + 过去分词。
例如:
- I have finished my homework.
- He has visited his grandparents.
使用时机
一般现在完成时用于描述已完成的动作或状态,而且与现在有关联。具体使用时机包括:
1. 表示过去开始,一直持续到现在的动作或状态
例如:
- I have lived in Beijing for 10 years.
- She has worked in this company since 2010.
2. 表示过去完成的动作对现在造成的影响
例如:
- I have lost my keys, so I can't get into my house.
- He has broken his leg, so he can't play in the match.
3. 表示过去发生的动作或状态,但对现在仍有影响
例如:
- I have read that book, so I know the story.
- They have seen that movie, so they know the ending.
注意事项
一般现在完成时是表示过去到现在的动作或状态,所以在句子中需要包含现在时态的时间状语,如:today, this week, this year等等。
例如:
- I have eaten breakfast this morning.
- They have watched three movies this week.
此外,要注意该时态的否定句和疑问句的构成方式:
否定句
否定句的构成方式为:主语 + have/has + not + 过去分词。
例如:
- I have not finished my homework yet.
- He has not visited his grandparents for a long time.
疑问句
疑问句的构成方式为:have/has + 主语 + 过去分词 + 其他?
例如:
- Have you finished your homework yet?
- Has she visited her grandparents recently?
总结
一般现在完成时是英语中常用的一种时态,用于表示已完成的动作或状态与现在的联系。我们需要注意该时态的构成方式、使用时机以及否定句和疑问句的构成方式。只有掌握了这些内容,才能更好地运用这种时态来表达自己的意思。