1. hear sb doing 听到某人正在做某事
2.be polite to sb 对某人有礼貌
3. 数词 + 单位+ (长, 宽, 高, 深, 年龄)的形容词
This river is 2 meters deep
The tree is about 200 years old.
an 8-year-old boy
4. twelfth , ninth
5. in one’s fifties 在某人50几岁时
6. What’s the date today? 今天是几月几号
What day is today? 今天星期几?
7. another +数词 = 数词+ more 表示再,又,还,
8. a day or two = one or two days 一两天
9. 序数词前加the 表示顺序 , 但序数词前a 表示再,又,还
1. keep in touch 保持联系
2. promise to do 答应做某事
3. since 用于完成时
4.
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