他说他不知道英文

不知道英文是：don't know.

1、don't

英 [dəʊnt] 美 [dont]

n.不要，禁忌；莫；别；甭

2、know

英 [nəʊ]  美 [no]

vt. 知道；认识；懂得

vi. 了解；熟悉；确信

过去式 knew 过去分词 known 现在分词 knowing

例句：

1、I don't know why such new gifted people have sprung up in my life.

我不知道怎么回事，在我的周围一下子涌现了那么多有才华的新人。

2、No one could know why he did like that.

没有人知道他这样做的缘故。

相关短语：

know how 秘诀；专门技术

don't know 我想不明白

know about 了解，知道……的情况；知道关于

don't you know [口语][用作插入语]你也知道；你是知道的，不是吗?

know as 称为

know what it is 知道是怎么回事，深知其中滋味 , 经历，遭受过

get to know 了解；认识

as we know 众所周知

in the know 知情的；消息灵通的

He doesn't know what to do or to say.

He doesn't know how to say and how to do

不知道一般有两种说法,以"我不知道"为例:I don't know. 或者说I have no idea.我爱你:I love you.