為什麼happen現在分詞不用雙寫n

因為happen的最後一個音節不是重讀閉音節詞，所以happen現在分詞不用雙寫n: happening

As it happens ， i have left the book at home .偏巧我把書放在家裏了。

Such a thing had never happened before .這樣的事，過去從未發生過。

What he tells us is unlikely to happen .他告訴我們的，不像是真事。

I shall be interested to know what happens .我很想知道情況會怎樣。

Things are happening so fast around here .這裏的事情發展得這樣快。

He realized at once what was happening .他一眼就看清了當時的情況。

There is no likelihood of that happening .沒有發生那種事情的可能。

I can not remember precisely what happened .我記不準所發生的事情了。

We must fulfill the plan ， whatever happens .無論如何要完成計劃。