冠词

1.泛指“一个/本/段/张/...”: rent an apartment, for a long time 2.任一：A horse is a useful animal. 3.每一：twice a month, write 800 words a day 4.说话者不认的“某一”： A Mrs Green is waiting for you at the school gate. 5.单一： He didn’t tell us a thing about it. 6.固定词组：as a result/whole/rule, make a living, make a trip, go on a diet, come to an end 7.区分a与an: an hour, an honest boy; a useful book, a one-way ticket

不 定 冠 词