第1句 从句最好用现在完成时,强调“通过了”（结果）
第3句 在周末 at或over the weekend 或 on weekends,一般不用in
第4句 用一般现在时比较好 find（不要过去时）,保持健康（应该是keep healthy,或keep fit）作主语,用动词不定式或动名词形式,本句改为：2种
从句：In the modern society more and more people find that to keep healthy is v isery important.
不用从句：用形式宾语
In the modern society more and more people find it very important to keep fit.
第5句 天气变得,应该用形式主语it,不是the weather,越来越冷（colder是cold的比较级,不是more and more,cold是单音节词）,而且两个句子间要用连接词
It is becoming colder and colder, and you'd better wear more clothes.