掌握创新用法
should 可表竟然,强调惊讶的情绪。
I can’t imagine this problem should be so easy.
我想像不出这个问题竟然这么容易。
had better 也可改为 had best ,其意义和用法不变。
I’m busy now,so you had best go there alone.
我现在很忙,所以你最好单独去那儿。
掌握句型变换方法
had better,should,ought to 均属于助动词,其疑问句、否定句及反意疑问句的构成均在自身形式上做变化。
变成否定句方法
had better do 否定式为 had better not do,should do 否定式为 should not do 或 shouldn’t do,ought to do 否定式为 ought not to do 或 oughtn’t to do .
变成一般疑问句方法
had better,should,ought to 构成一般疑问句时应分别将 had,should,ought 提到句首,其肯定与否定回答为 had / hadn’t,should / shouldn’t,ought / oughtn’t .
变成反意疑问句方法
had better,should,ought to 构成反意疑问句时通常使用 had / hadn’t,should / shouldn’t,ought / oughtn’t 形式。
She had better water the flowers as soon as possible,hadn’t she?
她最好尽快给花浇水,不是吗?
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