要变胖了英语怎么说

要变胖了英文可以说成"I'm going to gain weight."
来源：
这句话的来源是源自英语的语法结构和习惯用法。在英语中，"going to" 经常用来表示将要发生的事情。例如：
I'm going to the store. (我将要去商店。)
She's going to have a baby. (她将要生宝宝。)
另外，"gain weight" 意思是增加体重。例如：
I gained a lot of weight during pregnancy. (我在怀孕期间体重增加了很多。)
He's been working out and trying to gain weight. (他一直在锻炼身体并试图增加体重。)
综上，"I'm going to gain weight" 的意思就是"我要变胖了"。
下面是一些英文例句及其中文翻译：
I'm going to gain weight if I keep eating like this. (如果我继续这样吃下去，我要变胖了。)
She's going to gain weight if she doesn't start exercising. (如果她不开始锻炼，她要变胖了。)
He's going to gain weight if he doesn't watch what he eats. (如果他不注意他吃的东西，他要变胖了。)