1.[考點解析]時間介詞。in表示在某年、某季度、某月、某周、一天中某段時間。如：in 1999，in spring，in February，2002，in a week，in the evening.
on表示某一天或某天中的某段時間。如：on Sunday，on the morning of May 1，
on March 8，on a cold spring morning.
at表示某個具體的時刻。如：at eight oclock，at this time of year，at the moment，at the same time.
注意有些表示時間的.詞語前如有last，next或this，則一般不用介詞，如：last night/week/month/term/Sunday/Monday?
next week/month/term?
this year/week/month/term//Sunday/Monday?
the next day/week/month/term/year.
[真題再現] the evening of May 31?the 2002 FIFA World Cup started in South Korea. (北京海淀2002)
A. On B. At C. Of D. In
China became a WTO member
December 11th?2001. (北京崇文2002)
A. in B. at C. of D. on
________a cold morning?I opened the window and was glad to find that it was snowing outside. (北京東城2002)
A. By B. In C. At D. On
2.[考點解析]可數名詞和不可數名詞。
注意：當不可數名詞用在數詞+單位詞+of結構時，如果數詞和單位詞是複數形式，後面的不可數名詞也不能加-s或-es。如：two bottles of water?many glasses of milk?etc.
