有一个例句是：
问题描述：
有一个例句是：
It is not proper that you (should) wear a cap while eating.
是不是这种It is proper that 句型接从句要用should加动词原形的虚拟语气．
答
在It is/was +形容词后的that 从句中用should的结构,should 可以省略.这类形容词常见的有:advisable,anxious,compulsory,crucial,desirable,eager,essential,fitting,imperative,impossible,improper,important,natural,necessary,obligatory,possible,preferable,probable,recommended,urgent,vital etc