首先你要清楚fun作為名詞和形容詞各自的含義：fun當(dāng)名詞時(shí),當(dāng)“享樂(lè),樂(lè)趣,快樂(lè),享樂(lè)的事”的意思講時(shí),有be fun doingeg:It's not much fun going to a party on your own.(獨(dú)自一人參加聚會(huì)沒(méi)什么意思）fun當(dāng)形容詞...be fun doing 里，fun是名詞嗎？be動(dòng)詞后可以加名詞嗎？你看上面例句It's not much fun going to a party on your own.fun前面是形容詞much，再前面不就是be動(dòng)詞嘛，因?yàn)閒un是不可數(shù)名詞，所以前面不就冠詞a /an。