6. on the weekend = on weekends在周末
e.g. Tom often plays the piano on the weekend.
They like playing basketball on weekends.
7. good与well的辨析：
(1)good意为“好的”，为形容词，用来修饰名词或是置于be动词之后；
(2)well意为“好地”，为good的副词，用来修饰动词，放于动词之后。
e.g. Tom is a good doctor.
They can play the piano well.
8.when与what time 的区别：
(1)when和what time都可以用来询问表示时刻的时间；
(2)what time只能用来询问表示时刻的时间，即“几点几分”；而when的范围比较大，只要是时间点都可以使用。
e.g. (1)What time/When does Tom usually go to school every day?
He usually goes to school at 7:00 o’clock.
(2)When is it today?
It’s on Monday.
9. wear, put on, in, dress, have on的区别：
(1)wear意为“穿着（衣物）”，强调状态；
(2)put on意为“穿上”，强调动作；
(3)in表示穿着，后面接衣服的颜色；
(4)dress意为“穿……衣服”，常用结构：dress sb./dress well/be dressed in或dressoneself.
(5)have on意为“穿着”，和wear类似， 但have on 不用于进行时态。
e.g. She is wearing a beautiful skirt today.
It’s cold outside, put on your coat before you go out.
The man in a black shirt is my father.
He is dressed in a large coat.
He can dress himself.
She has a red skirt on.
10. either…or…, neither…nor…, not only…but also…, both… and…的区别：
(1) either…or…“要么……要么……”,表示两者中选其一；谓语动词单复数取决于就近原则；
(2) neither…nor…” 既不……也不……”，表示两者都不选；谓语动词单复数取决于就近原则；
(3) not only…but also…” 不但……而且……”，谓语动词单复数取决于就近原则；
(4) both…and… “两者都”，表示两者都选，作主语为复数。
e.g. Either you or Tom plays the role.
Neither Tom nor I am not students.
Not only Tom but also other students in my class are hardworking.
Both Tom and you are good students.
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