Tham khảo tài liệu 'oxford university8', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | accidently accidentally ACCIDENTLY ACCIDENTALLY You can remember this one by remembering how to spell accidental. There are quite a few words with -ally suffixes like incidentally which are not to be confused with words that have -ly suffixes like independently . Incidental is a word but independental is not. List of errors file C Temp livres commonerrors errors 09 2005 15 36 41 acronyms and apostrophes ACRONYMS AND APOSTROPHES One unusual modern use of the apostrophe is in plural acronyms like ICBM s NGO s and CD s . Since this pattern violates the rule that apostrophes are not used before an S indicating a plural many people object to it. It is also perfectly legitimate to write CDs etc. See also 50 s. But the use of apostrophes with initialisms like learn your ABC s and mind your P s and Q s is now so universal as to be acceptable in almost any context. Note that acronym was used originally only to label pronounceable abbreviations like NATO but is now generally applied to all sorts of initialisms. Be aware that some people consider this extended definition of acronym to be an error. List of errors file C Temp livres commonerrors errors 09 2005 15 36 41 acrossed across ACROSSED ACROSS The chicken may have crossed the road but did so by walking across it. List of errors file C Temp livres commonerrors errors 09 2005 15 36 .