Since or For? The Timeline Trick

Lovely! You're chatting with someone new at a party.

真好！你在派对上和一个新认识的人聊天。

They ask, how long have you lived here?

对方问：你在这里住多久了？

And you say, since three years.

而你回答："since three years"。

They nod politely... but they look a bit confused.

对方礼貌地点点头……但看起来有点困惑。

Here's the trick. Picture a timeline.

诀窍是这样的。想象一条时间线。

Since points to one moment on that line.

"since" 指向时间线上的某一个时间点。

For measures the whole stretch.

"for" 衡量的是整段时间的长度。

Since Monday. Since last summer. Since I was ten.

"Since Monday." "Since last summer." "Since I was ten."

Each one is a single point in time.

每一个都是一个单独的时间点。

But for three years. For two weeks. For ages.

但是："for three years"、"for two weeks"、"for ages"。

See? Each one is a length, like a piece of string!

看到了吗？每一个都是一段长度，就像一截绳子！

Oh, and here's a bonus!

哦，还有一个小彩蛋！

Both usually go with the present perfect.

两者通常都和现在完成时连用。

I've lived here for three years. I've lived here since last summer.

"I've lived here for three years." "I've lived here since last summer."

So next time, ask yourself one thing.

所以下次，只问自己一件事。

Can I point at it on a calendar?

我能在日历上指出它吗？

Yes? Since. No? It's a length, so for.

能？用 "since"。不能？那是一段长度，就用 "for"。

Now, how long have you been learning English?

那么，你学英语多久了？