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"had better" 表达的建议比 "should" 更强烈,带有一点警告或强调后果的意味,类似于“最好……否则可能会有不好的结果”。
I will feel very guilty if anything should [=were to] go wrong. … ” --- ( Merriam-Webster's Advanced Learner's English Dictionary: should )
suggest后接的that-clause中,动词用原形,真的是因为前面省略了should吗?