understand.
　　A比B（高，长s getting healthier and stronger than his brother.
　　表比s less rich than he.
　　表与其说，不如s more than a teacher.
　　Shes more than tired.
　　表并不比某某s no taller than you.
　　最高级 三者或三者以上比较某某最s one of the best students in this class.
　　第几大/长s a letter for you.
　　用于指初次提到某人/物 She has a dog.
　　指某类物或人中的任何一个 A horse runs fast.
　　用在不可数名词前表一次/场/或一个/种人或物 I would like a coffee.
　　用于时间、度量衡名词前表每一 He has two meals a day.
　　用于某些习惯用语或固定词组中 as a result，have a rest
　　have a chat，in a hurry
　　have a word with sb.
　　a little，a lot，a pair of
　　a cup of，a great deal of