英語兼類詞的變化講解：詞類變化，而詞形不變
英語中的詞類可以通過一定的構詞方法實現相互轉換。詞類之間的轉換一般有派生詞、兼類詞和合成詞三類。
1. 派生詞
派生詞是指那些由“詞根+詞綴”構成的新詞。其中詞綴可以分成前綴和後綴。前綴加在詞根前，後綴加在詞根後。
例如：
happy adj.高興的
happy+-ly→happily adv.高興地
un-+happy→unhappy adj.不高興的
2.兼類詞
英語中有不少詞，可以兼用作不同的詞類。當它們相互轉換詞類時，詞形不變化。
The ice has changed into water. (v.)
冰已經變成水了。
There will be a change in the weather. (n.)
天氣將要起變化。
Who can answer the question? Will you try? (v.)
誰能回答這個問題?你願意嗎?
I can do that. Let me have a try. (n.)
那件事我能做。讓我試一下。
Mum, my hands are clean now. Could I have a cake? (adj.)
媽媽，我的手乾淨了。我可以吃蛋糕嗎?
Jack helped his mother clean the kitchen. (v.)
傑克幫助他母親打掃廚房。
I’m afraid you’ve caught a cold. (n.)
恐怕你得感冒了。
They waited for the bus in the cold wind. (adj.)
他們在冷風中等公共汽車。
He speaks English and French well. (adv.)
他英語和法語說得很好。
He’s not feeling well today. (adj.)
他今天感覺不舒服。
It was raining hard. They had to stay in the bookstore. (prep.)
天下大雨。他們只好待在書店裏。
They went in one by one. (adv.)
他們一個接一個走進去。
Turn right and you’ll see the square. (adv.)
往右拐，你可以看到廣場。
The bank is on the right. (n.)
銀行在右邊。
I think that you are perfect the way that you are. (adj.)
我覺得你這樣就很完美了。
They perfected their plans during the day. (v.)
他們在白天完善了計劃
