英语句法：关键句型结构72种(5)

He is not so sick but he can come to school.
21． "疑问词 should…but "结构。
这个结构表示过去的意外的事，意为"none…but"，可译为"除了……还有谁会……"，"岂料"，"想不到……竟是……"等。
Who should write it but himself?
22． "who knows but (that)…"和"who could should…but"结构。
这个结构是反问形式，一般意译为"多半"，"亦未可知"等等，有时也可直译。
Who knows but (that) he may go?
23． "祈使句 and"和"祈使句 or"结构。
"祈使句 and"表示"If…you…"，"祈使名 or"表示"if…not…，you。
Add love to a house and you have a home. Aad righteousness to a city and you have a community. Aad truth to a pile of red brick and you have a school.
24． "名词 and"结构，在这个结构中。
名词等于状语从句，或表示条件，或表示时间。
A word, and he would lose his temper.
25． "as…,so…"结构。
这里的"so"的意思是"in the same way"（也是如此）。
此结构表明两个概念在程度上和关系上相似。
As rust eats iron, so care eats the heart.
26． "if any"结构。
"if any"和"if ever"，意思是"果真有……"，"即使有……"，表示加强语气。