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◆I don't know if it is polite in Japan.
我不知道在日本这样是否礼貌。
这是由if引导的宾语从句，if意为“是否”，不能省略。
if和whether 都可以引导宾语从句，意为“是否”，两者通常能互换，但不可省略。从句表一般疑问的意义。
E.g:我不能确定是否有不明飞行物。
I'm not sure if there are UFOs.
◆Understand the following sentences：
1. I don’t know if/whether I need to obey all the rules while I’m having dinner with my friends.
2. Could you tell me if/whether it’s polite to speak loudly at the table?
3. I don’t know if/whether you are right.
Michael arrives early.
Kangkang arrives earlier.
Jane arrives earliest.
2
Look at the pictures and match the parts of
the sentences.
Michael stays long.
Kangkang stays longer.
Jane stays longest.
Michael cooks well.
Kangkang cooks better.
Jane cooks best.
1.Would you mind if we learn to make it from you ?
我们向你学习做它（三明治）好吗？
（1）Would you mind if...请求允许或客气地请某人做某事。
E.g:我打开窗户好吗？
Would you mind if I open the window?
（2）learn to do sth.from sb. 向某人学习做某事
E.g:他向他父亲学习下棋。
He learns to play chess from his father.