英语中for+段时间，since+点时间，怎样区分点，段时间？要详细 英语中since/for怎么分辨点段时间？谢谢
\u4e5d\u5e74\u7ea7\u82f1\u8bed\u96be\u9898\uff01\uff01for+\u65f6\u95f4\u6bb5\u3001since+\u65f6\u95f4\u70b9\uff0c\u4ec0\u4e48\u53eb\u65f6\u95f4\u6bb5\uff1f\u4ec0\u4e48\u53eb\u65f6\u95f4\u70b9\uff1f\u5e76\u8bf7\u4e3e\u4f8b\u8bf4\u660e\uff1f\uff1f\u65f6\u95f4\u6bb5\u5c31\u662f\u4e00\u6bb5\u65f6\u95f4\uff0c\u6bd4\u5982\u4e00\u5e74\uff0cfor a year\u3002\u65f6\u95f4\u70b9\u5c31\u662f\u65f6\u95f4\u7684\u4e00\u70b9\uff0c\u6bd4\u5982\u4e00\u5e74\u524d\u7684\u4eca\u5929\u3002since last weekend
since+\u65f6\u95f4\u70b9
for+\u65f6\u95f4\u6bb5
He has been in the army for three years.
It is three years since he joined the army.(\u53c2\u519b\u4e4b\u65f6)
点时间就是从过去的某个时间点开始的，比如说 yesterday、2011、2 days ago~
给你两个例子
I have lived here since last week
I have lived here for 14 days
后面是具体时间就是一段时间的用 for
若后面是指 一个概念 指一个时间点 的用since 且since后可跟句I'm shy since I was young.
I have learned English for 3 years/since 3 years ago (3年为一段时间 三年前的那一天属于一个时间点）
I
段时间，就是持续的一段时间，，比如从上午到下午，从1995年到现在，点时间就如1995年、上午7点， 上周 就是一个时间点
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