What...? 与 Which...?
1. what 与 which 都是疑问代词,都可以指人或事物,但是what仅用来询问职业。如:
What is your father? 你父亲是干什么的?
该句相当于:
What does your father do?
What is your father’s job?
Which 指代的是特定范围内的某一个人。如:
---Which is Peter? 哪个是皮特?
---The boy behind Mary. 玛丽背后的那个男孩。
2. What...?是泛指,所指的事物没有范围的限制;而 Which...?是特指,所指的事物有范围的限制。如:
What color do you like best? (所有颜色)
你最喜爱什么颜色?
Which color do you like best, blue, green or yellow? (有特定的范围)
你最喜爱哪一种颜色?
3. what 与 which 后都可以接单、复数名词和不可数名词。如:
Which pictures are from China?
哪些图片来自中国?
频度副词的位置
1.常见的频度副词有以下这些:
always(总是,一直) usually(通常) often(常常,经常) sometimes(有时候) never(从不)
2.频度副词的位置:
a.放在连系动词、助动词或情态动词后面。如:
David is often arrives late for school. 大卫上学经常迟到。
b.放在行为动词前。如:
We usually go to school at 7:10 every day. 我们每天经常在7:10去上学。
c.有些频度副词可放在句首或句尾,用来表示强调。如:
Sometimes I walk home, sometime I rides a bike. 有时我步行回家,有时我骑自行车。
3.never放在句首时,主语、谓语动词要倒装。如:
Never have I been there.