问:(四川自贡杨丽)请看下列句子:The New Year is a time for resolutions.Mentally,at least,mostof us could compile formidable lists of“do’s”and“don’ts”.(《新概念英语第三册》)我不明白为什么 don’ts 不和 do’s 一样也在 don’t 的后面加一个复数符号(apostrophe)。此外,hows and whys 为什么没有变成 how’s and why’s?答:dos and don’ts 和 hows and whys 一般都不另加复数符号。把 dos 写成 do’s 大概是考虑按英语读音规则很可能把它 Q: (Sichuan Zigong Yang Li) Look at the following sentence: The New Year is a time for resolutionss.Mentally, at least, most of us could compile formidable lists of “do’s” and “don’ts”. (“ New Concept English Volume 3 ”) I do not understand why don’ts does not add the apostrophe to do not, just as does do’s. Also, why did hows and whys not become how’s and why’s? A: dos and don’ts and hows and whys generally do not include any more signs. Writing dos to do’s probably take it into consideration by the rules of English pronunciation