The doctor said that I should be on a diet.

医生说我必须节食.

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Mary prefers not to be on a diet.

玛丽宁愿不吃减肥食谱.

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Linda always to be on a diet.

琳达好像一直在节食.

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If you do not mind, could you tell me when you to be on a diet?

如果你不介意的话, 请告诉我你是什么时候开始节食的.

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You should be on a diet; otherwise you will get fatter and fatter.

你应该节食, 否则你会越来越胖.

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