a number of v.s. the number of

a number of 意指 若干的；很多的 動詞必須用複數。

ex. A number of books are missing.

the number of 意指 數目；總數 動詞用單數。

ex. The number of the students in our class is forty-five. 

英文縮寫的限制

am not 不可縮寫 amn't

this is 不可縮寫 this's

what is it? 不可縮寫 what's it?

see a movie v.s. watch a movie 看電影

see a movie 指在電影院看電影

= go to a movie

= go to the movies

the movies = movie theater = the cinema (電影院)

時間說法的英文

hour 時；minute 分；second 秒

year 年；month 月；day 日

2:15  two fifteen ;  a quarter past two

2:30 two thirty ; half past two

2:45 two forty-five ; a quarter to three

half an hour = a half hour 半小時

one and a half hours = one hour and a half 1小時半

不可數名詞常用計量詞

a slice of bread

a loaf of bread

a piece of chalk

a piece of paper  一片紙片

a sheet of paper  一張紙

獎牌說法的英文

gold medal  金牌

silver medal 銀牌

bronze medal  銅牌

不同發電方式的英文

thermal power  火力發電

water power  水力發電

wind power  風力發電

nuclear power  核能發電

solar power  太陽能發電