助动词 (Modal Auxiliaries)

1.语气助动词，给予主动词一种感情的色彩，如许可、禁止、猜测、可能、潜力等。

2.助动词 + V ; 助动词 + not + V; 助动词 + S + V ?

can, could, be able to

能力

Michael can speak French. Michael会说法文。

Can he (=Is he able to) speak German, too? 他也会说德文吗？

I could (=was able to) speak a little Spanish.

我以前会说一点点西班牙文。

I can't solve this math problem. 这道数学题我解不出来。

Cats are able to climb trees. 猫会爬树。

What can I do for you? 有何贵干？

I could (=was able to)run fast when I was young.

我年轻的时候跑得很快。

She spoke pretty fast, but I could (=was able to) understand what she was saying.

她说话相当快但我了解她说什么。

I couldn't (=wasn't able to) sleep well last night.

我昨晚睡不好。

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