小学生可以从3年级开始学习《新概念英语》。

《新概念英语》开始就是实用日常对话，没有更基础的准备过程(例如字母、较简单的句子等)，所以需要一定英语基础才能学习。3年级的学生已经在学校学了两年英语，对英语已经不陌生，而且心智和学习能力也具备了，就可以开始学习《新概念英语》了。

①打招呼，问好

Good morning? Good morning! 早上好?早上好!

How old are you? I am (four). 你几岁了?我(四)岁。

Are you OK? Yes, I am OK. 你还好吗? 我挺好的。

②表扬，感谢

You are clever! 你真聪明!

Happy New Year! 新年快乐!

Miss Li, you are very beautiful! 李老师你真漂亮!

Thank you very much! 非常感谢你!

③道歉

I am sorry. 对不起。

Never mind. 没关系。

1、The children were running on the playground as fast as they can.

改：can-could

解释：主句是过去进行时，从句也应该是过去时，保持一致。

2、Since her husband had died, so she had to support her family.

改：把so去掉。

解释：since表示原因，不需要so再来表示结果。两个词不能同时用在一个句子中。

3、He won't go out until his mother will come.

改：will come-comes

解释：主句是一般将来时，until引导的时间状语从句用现在时表示将来，改为第三人称单数。

4、He was very foolish that he didn't pass such an easy exam.

改：very-so

解释：so...that，如此……以至于。

5、Tom had gone out as soon as his mother got home.

改：had gone-gone

解释：主句用一般过去时。

6、It was three months since he came to our school.

改：was-is

解释：从过去到现在的一段时间，用现在时。

7、The platground of our school is larger than their school.

改：加上 that of (their school)。

解释：操场要和操场作比较，不是跟学校比。用that来指代。

8、The streets in Nanjing are wider than Shanghai.

改：those in (Shanghai)。

解释：街道要和街道比较。用those来指代复数的名词。