你一定要权衡利益与成本二者的得失。
你一定要这样粗鲁吗？
倘使你一定要知道的话，这是我男朋友给的。
你一定要原谅我父亲—他并不总是那样粗暴无礼。
这把她的魂都吓飞了，如果你一定要知道的话。而且我也被吓坏了。
It scared the hell out of her, if you must know. And me, too.
你一定要找个时间过来。
这里有一些特别的博物馆，你一定要去看看。
你一定要去莫斯科！
如果你一定要抽烟，请选择吸烟区第一排的座位。
If you must have a cigarette, choose a seat in the first row of the smoking section.
你一定要回来啊！
有时，你一定要能够理解所写的内容并解释其含义。
Sometimes, you must be able to understand what is written and explain the meaning of them.
如果你一定要油炸，一定要把食物放在厨房的纸上，翻动几次尽量把油吸干。
If you must deep fry, be sure to drain the food on kitchen paper, turning it a few times to drain off as much oil as possible.
你一定要仔细看清他们的面孔。
你一定要把面包片切得厚厚的。
你一定要来，不来可不行！
你一定要好好照顾他。
给孩子们零花钱时，你一定要确保他们攒下一部分。
When you give kids pocket money make sure they save some of it.
“你一定要来参加托德的毕业派对。”——“非常乐意。”
"You have to come to Todd's graduation party."—"I'd be delighted."
医生下周还会给你看病。在此期间，你一定要尽可能多休息。
The doctor will see you again next week. Meanwhile, you must rest as much as possible.
如果你一定要呆在阳光下的话，就用你能买到的最有效的防晒霜。
If you must be in the sunlight, use the strongest sunscreen you can get.
在那家当地商店可能关门时，你一定要确保自己有度过难关的食物。
Make sure you have food to tide you over when the local shop may be shut.
你一定要来我家和我一起吃汉堡。
你一定要在你的小妹妹睡觉的时候发出这么多噪音吗？
Must you make so much noise when your little sister is sleeping?
如果你一定要去踢足球，至少要等到放学。
If you must go and play football, at least wait until school is over.
穿一套漂亮的西装，打一条领带，第一次见客户时，你一定要准时到，好吗？
Wear a nice suit and a tie, and you first meet the customer, you should be sure to arrive on time for a meeting, OK?
他说：“我的主啊，你一定要记住我。”
你一定要学会享受旅程！
你一定要去看布拉德·皮特的那部新电影。
“是啊，你一定要来看。”玛丽很严肃地说。
从栅栏的另一边看很好，但你一定要好好地看看。
It's good to look on the other side of the fence, but make sure you take a good long look.
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