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044 When heated, water will expand.水加热时会膨胀。

语法点过去分词作时间状语

说明

过去分词作时间状语时，其作用相当于时间状语从句，有时前面带when, once等从属连词。如：

Translated into English (=When it was translated into English), the sentence was found to have an entirely different word order．这个句子翻译成英语以后，词序完全变了。

I won't go until invited (=...until I am invited)．我要接到正式邀请才去。

Carl: Did you mark the spot where you caught all those fish?

Ted: Yes, I put a big X on the side of the boat.

Carl: What will you do if you can't get the same boat next time?

小幽默

谜语

—What travel all over the world but end up in the corner?

—Stamps.