begin的過(guò)去式和現(xiàn)在分詞怎么寫(xiě)

　　例句：

　　He began to perspire heavily.

　　他開(kāi)始大量出汗。

　　Slowly things began to improve.

　　慢慢地，情況開(kāi)始好轉(zhuǎn)了。

　　He began to tie his shoelaces.

　　他開(kāi)始系鞋帶。

　　It was beginning to snow.

　　開(kāi)始下雪了。

　　The paintwork is beginning to peel.

　　漆面已經(jīng)開(kāi)始剝落了。

　　The economy is beginning to revive.

　　經(jīng)濟(jì)開(kāi)始復(fù)蘇。