过去式： were
过去分词： been
现在分词： being
易混淆的单词： AreARE

提示：点击例句中的单词，就可以看到词义解释

Cities are products of trade .

城市是贸易的产物。

What are you doing ?

你是做什么的？

They are all protein foods .

他们全是蛋白质食品。

These products are rare earths .

这些产品是稀有金属。

And yet what are dreams ?

然而什么是梦想呢？