He turned a good writer.当名词前有形容词时turn后要a吗?

应该是对的 有人用这个做例句的
.特殊词：① 当man人类,word 消息,turn系此后表语n,不用.
Word came that he would go abroad.
Man will conquer nature.
He turned writer/He turned a good writer/ He became a writer.
2.某些抽象名词具体化时是可数名词,其前可加a
surprise,fire,joy,must
He is a success as a teacher.
Long Jing is a famous tea in China.
Know ledge is a must in international trade today.
3.于姓氏前表示某个只知道名字而不太熟悉的人用a.
A Mr Liu is waiting to see you outside.
4.有无冠词,意义不同
①有the表示全体,无the表示部分.
(the) 3 of them
They are (the) pupils of Class One.
②有the表示具体,无the表示引申.
go to (the) school,go to (the) bed,lie in (the) bed,be in (the) hospital,at (the) table,go to sea当水手go to the sea去海边
in future从今以后,将来in the future未来
on earth究竟on the earth在地球上,在世上
in front of在…外部的）前面in the front of在（内部的）前面
③职位官职的名词前,无art表示独一无二的正职,有art表示为其中之一.
He was (a) principal of our college.
④n抽象化,带有adj特征时,其前不用art.
She is a mother of 3 children.
She is more mother than wife.
He is a good friend of mine.
He is friend enough to help me.
⑤as 引导的让步状语,表语名词前提时
Young boy/Child as he is,he knows a lot.
Teacher as he is,he is not capable of teaching.