zìcóng zhīdào juānzèngdiǎn yǐhòu, wǒ méi làngfèi guo jiùwù.

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Breakdown of zìcóng zhīdào juānzèngdiǎn yǐhòu, wǒ méi làngfèi guo jiùwù.

• 没méi: not
• 过guo: experiential aspect particle
• 以后yǐhòu: after

Questions & Answers about zìcóng zhīdào juānzèngdiǎn yǐhòu, wǒ méi làngfèi guo jiùwù.

Why does the sentence use both 自从 and 以后? Aren’t they both about time?

Yes, both relate to time, but together they form a very common pattern:

自从 + event/time + 以后, ...

This means ever since... or since...

In this sentence:

自从知道捐赠点以后，我没浪费过旧物。

it means:

Ever since I learned about donation points, I haven’t wasted old items.

A quick way to think about it:

• 自从 = marks the starting point
• 以后 = means after that

Using both is natural and common in Mandarin. It is not considered strange or overly repetitive.

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What exactly does 知道 mean here? Is it know, find out, or learn about?

Here 知道 is best understood as learn about or come to know about.

In English, know can sound like a stable state, but in Chinese, 知道 can often refer to the moment or fact of becoming aware of something, depending on context.

So:

• 知道捐赠点 = know about donation points
• In this sentence, because of 自从...以后, it strongly suggests after I found out about donation points

If you wanted to make the idea of finding out even more explicit, Chinese might also say:

• 自从知道了捐赠点以后...
• 自从了解到有捐赠点以后...

But the original sentence is fine.

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Can 知道 really be followed directly by a noun like 捐赠点?