Should的常用句型有：
1. Should we do this? 我們應該做這個嗎？ 2. Should I go now? 我現(xiàn)在就該走嗎？ 3. Should you have known, would you have done it? 要是你早知道的話，你會怎么做？

應該使用should的常用句型包括建議、規(guī)定和可能性表達。比如，“你應該按時完成作業(yè)?！薄胺梢?guī)定應該遵守交通規(guī)則?！薄拔液芸赡軕撓戎贫ㄓ媱?。”這類句型中，should強調(diào)推薦性、必要性或是個人的建議。

should用于表達建議，推測，義務或責任的句型較多，如"you should go now"，"he should have finished it"，"we should take action"。還有，表示主觀建議或者可能性的句型也常用should，例如"you should consider his opinion"，"it should be a good idea"。

It is necessary/important that + 主語 + (should) + 動詞原形 It is suggested that + 主語 + (should) + 動詞原形