以下句子有什么短语（或语法）及其用法和中文解释：
例如：She kept us waiting for a long time.(keep sb. /sth. doing 让某人持续作某事)
1. He couldn't help crying when he heard the sad news.
2.The more carefully you work ,the fewer mistake you will make.
3.After you use the plastic bags you mustn't throw them about.
4.We must protect the trees from fire.
5.He ran out of gas a mile from home.
6.I think students are supposed to wear school uniforms at school.
7.Parents should stop their children from telling lies.
8.I happened to meet my aunt.
9.He was tired of doing the same work every day.
1. He couldn't help crying when he heard the sad news.(can't help doing sth 忍不住。。。。 )2.The more carefully you work ,the fewer mistake you will make.(the比较级...the比较级越。。。越。。。)3.After you use the plastic bags you mustn't throw them about.(throw sth about 乱扔。。。)4.We must protect the trees from fire.(protect sth from 保护。。。避免)...
