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1·We are in the third grade now.

我们现在三年级了。

2·They are both in the third grade.

他们两人都是3年级。

3·He's in the third grade.

他在读三年级。

4·I am in the third grade.

我上三年级。

5·There are 16 classes in the third grade.

三年级共有16个班。

6·He was teaching the third grade last year.

当然了，他去年教的是三年级。

7·Our mother had only been able to get through third grade.

我们的母亲只能上完三年级。

8·The year I was fifteen, my younger sister reached the third grade.

我十五岁那年，我妹妹上了三年级。

9·He was in the third grade last year and now he is in the fourth grade.

他去年读三年级，今年读四年级。

10·I was kicked out of school when I was in third grade for refusing to salute the flag.

我在三年级的时候因为拒绝向国旗敬礼而被退学。