would+現在分詞

① 過去將來進行時：should be doing ， would be doing

例：The government promised that a new highway would be being built next July.

②有時可代替一般現在時，表達一種婉轉、客氣、禮貌、商量的語氣。

如：

Would you mind my sitting here?您介意我坐在這裡嗎

③would have + 過去分詞」用來表達過去想做的事，但卻沒做。

例：I would have called you， but I was too busy.我想打給你的，但我太忙了。(想打，但卻沒打)

④would(should)+動詞原形　 過去將來時常可用來表示過去習慣性的動作。此時，不管什麼人稱，一律用would。

例如：

1) Whenever she had time，she would do some reading. 她一有時間，總是看書。

2) I would play with them when I was a child. 當我還是孩童時，總是和他們一起玩。