should同义词组

should意为应该，它的同义词组有ought to，be supposed to。ought to一般用于阅读中，用法普遍。be supposed to是比较正式的说法，书面语较多。

You ought to scrap the old bike and buy a new one.你应该扔掉这辆旧自行车，买一辆新的。I think I ought to get back to work.我想我该回去工作了。Perhaps we ought to have trusted people more也许我们本当对人多一些信任的。