I'm pretty busy these days and I have(前面半句是一般现在时,后面时态 也要一致)no time to keep a diary(写日记是这个短语). The day before yesterday, I went to.看不清 and climed the ... mountain(不加s). Climbing is good for our health, but it made(单三,climb指一件事) my legs hurt. (exhaust精疲力竭的,是指一个人,不能单指腿.这句你也可以说it makes me exhausted.) But(我认为这没必要转折,可以去掉but.) the food was good. All the vegetables were(不是was) planted by my classmate's(是一个同学的叔叔吧.你那样写就是很多同学的叔叔了) uncle. It was not(否定pollute这个动词用not,否定名词采用no) polluted.
第二段前面的没什么问题.最后一句可以改成,比较符合用语习惯.I'll be a hard-working leaner. 不过你的原句也没有语法错误.
Tomorrow will be my second time to learn dance. I'll not be late （again） for class like yesterday.
