[解析]
Dear Li Hua,
I'm sorry to hear that you've been ill for days.How are you feeling now?
I know that you are devoting all your energy from study.But I just want to say exercises is as important as study. Do exercise will not waste your time.Instead,it can refresh your mind.After one and two hours' exercise,you can study more effective.Only when you have the strong body can we keep on studying without feeling uncomfortable. However your study will be affected by your health.
I hope you can take at least one hour's exercise each day before you recover from your illness.I wish you will be well soon.
详解:
1.from改为to;考查固定搭配,devote …to do 是固定搭配,意为"投入…做某事".
2.Exercises改为exercise;考查名词,此处exercise意为"锻炼"是不可数名词,没有复数形式.
3.Do改为Doing;考查非谓语动词,此处用动名词形式在句中做主语.
4.and改为or;考查连词,one or two hours意为"一两个小时".
5.effective改为effectively;考查副词,此处用副词作状语修饰动词study.
6.the改为a;考查冠词,此处用不定冠词a 表示泛指"一个强壮的身体".
7.we改为you;考查人称代词,此处人称代词应与前面的主语有保持一致.
8.However改为Otherwise;考查句意关系,分析句意应为"否则你的学习将会受到健康状况的影响",故用Otherwise.
9.before改为after;考查介词,分析句意为"我希望在你康复之后每天至少要锻炼一个小时",故用after.
10.will改为would;考查虚拟语气,wish后面的从句用虚拟语气,主句为一般现在时,从句用一般过去时.