He should know. He has been through it once already in the past 10 days.
他知道，这种情况已经持续10天了。
The doctor recommended that he (should) stay in hospital for a few more days.
医生建议他在医院里多待几天。
The question whether he should give it up has been worrying him for days.
他该不该放弃这个问题几天来一直困扰着他。
He has worked on the book for seven days, he should have finished it now.
他弄这本书已有7天了，到现在为止应该已经完成了。
He has worked on the book for seven days, he should have finished it now.
他弄这本书已有7天了，到现在为止应该已经完成了。
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