他加入电影界时,是写剧本的.用英语怎么说？

他加入电影界时,是写剧本的.

He had began his motion - picture career as a writter.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

began

v. 开始( begin的过去式 )，着手，创始，创办；

例句
He began comically ad-libbing a script...
他即兴调侃起了一段剧本。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

motion

n. 运动，手势，动机，意向，请求；vt. 打手势，向某人点头或摇头示意，打手势要求[指示]；vi. 运动，打手势；

例句
A motion backing its economic policy was carried by 322 votes to 296.
一项支持其经济政策的动议以322票对296票通过。

picture

n. 照片，画像，图画，图片，影片，情景；vt. 构想，想象，描绘，画，描述；

例句
I looked for Wyman's picture in my high-school annual...
我在中学年刊中寻找怀曼的照片。

career

n. 生涯，职业，事业；vi. 全速前进，猛冲；

例句
...a second career which absorbed her more completely than her acting ever had.
比演艺生涯更让她投入的又一职业

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。