diet to do sth
用不定式说明节食的目的，如减肥或增重。
She is dieting to lose weight before the wedding.
她正在节食，想在婚礼前减肥。
控制饮食；节食
dieting — present participle of diet
调整饮食和饮料摄入以减少或增加体重或影响健康。；照规定饮食；忌食
to control what and how much you eat or drink in order to change your weight or improve your health
调整饮食和饮料摄入以减少或增加体重或影响健康。
To modify one's food and beverage intake so as to decrease or increase body weight or influence health.
一般现在时
She diets to stay healthy.
她节食以保持健康。
一般过去时
He dieted for two months last year.
他去年节食了两个月。
现在进行时
I am dieting this week.
我这周在节食。
规则动词，注意现在分词拼写为dieting。
She has been dieting for two months to prepare for the marathon.
她为了准备马拉松已经节食两个月了。
用法提示：这里 dieting 是动词 diet 的现在分词，表示有节制地调整饮食。
My doctor told me to diet carefully because of my blood pressure.
医生告诉我因为血压问题要小心控制饮食。
用法提示：这里 diet 作动词，意为按健康需求调整饮食。
After the holidays, he diets for a few weeks to lose weight.
假期过后，他会节食几周来减肥。
用法提示：这里 diets 是 diet 的第三人称单数形式，表示控制饮食以减轻体重。
用不定式说明节食的目的，如减肥或增重。
She is dieting to lose weight before the wedding.
她正在节食，想在婚礼前减肥。
现在完成进行时强调节食已持续一段时间，并可能仍在继续。
He has been dieting for two months.
他已经节食两个月了。
diet on sth 说明节食期间主要吃的食物。
She dieted on vegetables and fish for a month.
她一个月里靠吃蔬菜和鱼来节食。
grammar · medium
易错句子My brother diet every day to lose weight.
正确表达My brother diets every day to lose weight.
主语 my brother 是第三人称单数，一般现在时动词要加 -s，diet 的第三人称单数为 diets；汉语动词不随人称变化，所以容易漏掉词尾 -s。
grammar · medium
易错句子I diet for lose weight.
正确表达I diet to lose weight.
表示目的要用不定式 to do，不能用 for + 动词原形；汉语“为了减肥”若逐字翻译成 for lose weight 就错了，应说 to lose weight。
grammar · medium
易错句子She is dieting herself to get thinner.
正确表达She is dieting to get thinner.
diet 在此义上是不及物动词，后面不能接反身代词作宾语，直接接目的状语即可；汉语“让自己节食”的说法容易让人误加 herself。
节食并锻炼身体
She diets and exercises to stay in shape.
她节食并锻炼以保持身材。
开始节食
He started dieting after his doctor's warning.
医生警告后,他开始节食。
停止节食
She stopped dieting and felt much happier.
她停止了节食,感觉开心多了。
为减轻体重而节食
Many people diet to lose weight quickly.
很多人为了快速减肥而节食。
严格控制饮食
He has been dieting strictly for three weeks.
他已经严格节食三周了。
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节食数月
She dieted for months before the wedding.
婚礼前她节食了好几个月。