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下面这两个句子都表示过去发生的事情，但重点不同：
我是昨天买的苹果。
I bought the apples yesterday.
我昨天在商店买了苹果。
I bought some apples at a store yesterday.
1. “是……的”：强调具体信息
“是……的”用来强调已经发生的事情的时间、地点、方式或人物。
The “是……的” structure emphasizes the time, place, method, or person involved in a past event.
强调时间｜Time
我是昨天买的苹果。
I bought the apples yesterday.
重点是“昨天”，不是今天。
The emphasis is on yesterday, not today.
强调地点｜Place
我是在超市买的苹果。
I bought the apples at the supermarket.
重点是“在超市”。
The emphasis is on where the apples were bought.
强调方式｜Method
我是在网上买的苹果。
I bought the apples online.
重点是“在网上”。
The emphasis is on how the apples were bought.
2. “了”：说明事情发生了
我昨天在商店买了苹果。
I bought some apples at a store yesterday.
这是一个普通的叙述句。“昨天”表示过去的时间，“了”表示“买”这个动作已经发生或完成。
This is a neutral statement. “昨天” shows the past time, while “了” indicates that the action happened or was completed.
简单来说：
“了”告诉我们：发生了什么。
“了” tells us what happened.
“是……的”告诉我们：事情是在什么时候、什么地方或用什么方式发生的。
“是……的” tells us when, where, or how it happened.
你学会了吗？在我的口语课上来练一练吧！
Have you learned it? Come and practice it in my speaking class!
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