It could be fun to play with him. fun为什么是名词，而不是形容词

\u4e3a\u4ec0\u4e48fun\u662f\u540d\u8bcd\uff0c\u4e0d\u662f\u5f62\u5bb9\u8bcd\u5417\uff1f

\u8981\u770b\u5b83\u7684\u8bed\u5883
\u540d\u8bcd n. [U]

1.\u5a31\u4e50,\u4e50\u8da3
What fun we had!
\u6211\u4eec\u73a9\u5f97\u591a\u5f00\u5fc3!
2.\u73a9\u7b11,\u5b09\u620f
His uncle is fond of fun.
\u4ed6\u7684\u53d4\u7236\u559c\u6b22\u5f00\u73a9\u7b11\u3002
3.\u6709\u8da3\u7684\u4eba(\u6216\u4e8b\u7269)
Mr. Smith is great fun.
\u53f2\u5bc6\u65af\u5148\u751f\u662f\u4e00\u4e2a\u5f88\u6709\u8da3\u7684\u4eba\u3002

\u5f62\u5bb9\u8bcd a.

1.\u3010\u7f8e\u3011\u6709\u8da3\u7684,\u6109\u5feb\u7684[B]
We had a fun night in the club.
\u6211\u4eec\u5728\u4ff1\u4e50\u90e8\u5ea6\u8fc7\u4e86\u4e00\u4e2a\u6b22\u4e50\u7684\u591c\u665a\u3002

\u4e0d\u53ca\u7269\u52a8\u8bcd vi.

1.\u3010\u53e3\u3011\u5f00\u73a9\u7b11;\u8bf4

rainy, windy, sunny, funny, healthy,
snow, cloud

亲：这是句型所在。
It + be +名词 + to do sth 做某事是乐趣。

FUN即是名词 也是形容词，在此处应该是形容词，作表语。

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