year
1.a five-year-old boy，a twenty-year-old school等比a five-years-old boy，a twenty-years-old school等普通。
2.We studied together for years和His mother died years ago等句子里的years都作“好几年”解。不可用years指几十年或一百多年，如不可说Years ago the telephone was invented或Wealth of Nations（国富论）was first published years ago。
3.the time of (the) year（这个季候）和this time of (the) year里的the似乎用的少，不用的多。
4.the year (of) 1999等表达方式里的of用的少，不用的多。通常只用1999等，不用year。
5.习惯上不说How many years old are you? 或I do not know how many years old he is，该把many years删去。
6.His father died in the same year和Her second novel appeared in the following year等句子里的in往往省去。
7.He came to Beijing at fourteen (years)里的years用的少，不用的多。
8.year in year out和year in，year out（有逗号）和year in and year out都可以说，第三式最不普通。
9.I hope the book will go through many editions over the years里的over the years作“在这（或那）几年中间”解。
