15.have的用法辨析：
(1) 表示“吃”，相当于eat;
e.g. have/eat breakfast / lunch/dinner/supper吃早餐/午餐/晚餐
have two eggs for breakfast早餐吃了两个鸡蛋
(2) 表示“有”，表示某人拥有某物，表所属关系；
e.g. I have two basketballs.
Tom has a blue schoolbag.
(3)表示“上课”。
e.g. Today Mary has three English classes.
I have math class every day.
16. 时间介词“in”，“on”，“at”的区别：
(1) in的用法：
①in+超过一天的时间词（month/season/year/century等），表示“在……时间点”；
e.g. in 2008 在2008年
in spring/ summer/ autumn /winter在春季/秋季/秋季/冬季
in April/October 在四月/十月
in the 21stcentury在二十一世纪
② in +时间段，表示“在多长时间之内或多久以后”；
e.g. in three days三天以后；在三天以内
in five years在五年以内；在五年以后
③“in +时间”，若表示时间点，用特殊疑问词when来提问；若表示时间段通常用how soon“多久以后”来提问; “in +时间段”和how soon通常和将来时连用。
e.g. When did Tom live in Kunming?
In 1998. / In April. /Inspring.
How soon will your father will leave Shanghai?
In five months.
(2) on的用法：
①on +具体到某一天的时间词（day/date等）;
e.g. on Monday/Sunday在星期一/在星期天
on the National Day在国庆节
on Sunday morning/ afternoon/evening在星期天早上/下午/晚上
on September 1st在九月一号
②“on +时间词”，表时间点，通常用特殊疑问词when来提问；
e.g. When will the meeting starts?
On Friday morning.
When is the National Day?
It’s on October first.
③在“几月几号”用时间介词on;有on时用when来提问；无on时用what’s the date?来提问。
e.g. What’s the date today?
It’s June 1st.
When is it today?
It’s on June 1st.
④在“星期几”用时间介词on；有on时用when来提问；无on时用what day来提问。
e.g. What day is it today?
It’s Monday.
When is it today?
It’s on Monday.
(3)at的用法：
①at+表“几点几分“的时间词（hour/minute等）；
e.g. at six thirty在6：30
at seven 在7：00
②“at +时间词“，表示时间点，可用when或者what time来提问。
e.g.What time/When does Tom go to school every day?
Tom usually goes to school at seven o’clock every day.
When/ What time will the English class begin?
It will start at 5:30 in the afternoon.
(4)有关时间介词in, on, at的固定搭配：
e.g. in the morning/ afternoon/evening在早上/下午/晚上
in time及时
at night/noon/ dawn /dusk在晚上/正午/黎明/黄昏
at the moment此时此刻
at present目前，现在
at that time在那时
on time准时
17.be busy (in) doing sth.意为“忙于作某事”；
be busy with sth.意为“忙于某事”。
e.g.Tom is busy (in) doing his homework today.
Tom is busy with his homework.
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