in doing 開頭的句型

如:

In handing down this sentence， Judge said it‘s nessesary to deter others

這裡的In doing 相當於When handing down this sentence

表示“在做...時”，可看做一個時間狀語

doing開頭一般來說 是動名詞做主語，位於句首，謂語動詞要用單數。

Playing on the beach is a pleasant thing for me.

Doing exercise every day makes us healthier and healthier.

1，be fortunate in doing sth做某事是幸運的 .

2，be busy in doing sth忙於做某事 .