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