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  • Hi, my name is Rebecca from

    嗨!我是 engVid 的 Rebecca。

  • In today's lesson, you'll learn how to express yourself when you don't know something in English.


  • This is actually such an easy method that I think by the end of this lesson, you'll already start using it.


  • So, let's have a look at the board and see how it works.


  • You start by using the phrase: "I don't know", and you connect it to one of these words or expressions.

    首先,用「I don't know」開頭,然後加上以下單字詞組。

  • For example: "I don't know who is going to the party." "I don't know what to do." "I don't know what to say." "I don't know what to cook."


  • Right? "I don't know when he's arriving." "I don't know where my glasses are." "I don't know why she left her job." "I don't know how to reach him."


  • "I don't know how to drive." "I don't know how to swim." And so on.


  • "I don't know how much it costs." "I don't know how many people were at the concert."


  • "I don't know how often he goes to the club." "I don't know whether Jane has arrived."

    我不知道他多久去一次夜店;我不知道 Jane 到了沒。

  • "Whether", spelt like this: "whether" means "if". All right? It's another word for "if"

    Whether 和 if 的意思一樣,都是「是否」的意思。

  • "I don't know whether Jane has arrived yet." "I don't know if I locked the door." "I don't know if I locked the door."

    我不知道 Jane 是否到了;我不知道門是否有鎖。

  • So, you can see that by using that one expression "I don't know" with any of these words, you can express a range of information.

    只要「I don't know」和下列這些字詞並用,就能傳達許多意思。

  • Now, a couple of points to keep in mind.


  • You can use this expression and combine it with present, past, or future tense.

    「I don't know...」在現在、過去和未來式都可以使用。

  • What do I mean? Well, you could say, "I don't know who usually goes to his parties." That's present tense.


  • "I don't know who went to his party." Past tense.


  • Or "I don't know who is going to his party." Future tense. Right?


  • So you can do this with all of these words; you can use it in the present, in the past, or in the future.


  • And one last, very important point to keep in mind, regarding the word "know", regarding the verb "know".

    最後,非常非常重要的一點,注意動詞 know 的用法。

  • The verb "know" is a stative verb. A stative verb means that you cannot use it in the continuous form.

    Know 是狀態動詞,不能用在進行式中。

  • You can only use it in the simple form, like this.


  • So you can only say "I don't know", not "I am not knowing."

    所以,你可以說「I don't know」,但不能說「I'm not knowing.」

  • Many people in different parts of the world use... tend to use continuous forms for everything in English,


  • but you have to be really careful not to use the continuous forms with stative verbs.


  • "Know" is a very common stative verb; there are many others like it.

    除了 know 這個常見的狀態動詞外,其他狀態動詞也一樣。

  • So other than that, you're fine.


  • You couldn't say... sorry, you could also say: "I don't know" or "I didn't know". All right?

    你也可以用過去式 I didn't know。

  • So you could use this part, but remember not to change the verb "know".

    可以改變 don't 的部分,但 know 本身不能任意改變。

  • If you'd like to practice this, please go to our website at


  • There, you'll find a quiz on this subject.


  • And if you found this lesson useful, please subscribe to my channel on YouTube.

    如果覺得本課程有用,也可以訂閱我的 Youtube 頻道。

  • Good luck with your English. Bye for now.


Hi, my name is Rebecca from

嗨!我是 engVid 的 Rebecca。

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教你十種 I don't know 的延伸用法! (10 ways to say "I don't know" in English)

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