高中英语的几个问题

1.The top of the mountain (is coverd with)覆盖着 snow all the year round. coverd with能不能改成covered by,不能的话是为什么
2.take place happen occur的用法有什么区别(详细些)
3.He must be used to living without a car,mustn't he?这句话什么意思
-Must I finish the translation within two hours?
-No,you needn't.You (may) hand it in tomorrow morning.
括号里改成can行不行?为什么

1、可以。前者是词组，后者是被动，但意思一样。
2、三者当“发生”讲，区别无外乎是具体用法和细微的差别，只能记忆，帮你查了一下
take place
to happen, especially after previously being arranged or planned:尤事先有安排
例句
The film festival takes place in October.
We may never discover what took place that night.

happen
1[v] to take place, especially without being planned:尤没有安排
You’ll never guess what’s happened!
Accidents like this happen all the time.
Let’s see what happens next week.

2[v] to take place as the result of sth:作为某事的结果
She pressed the button but nothing happened.
What happens if nobody comes to the party?
Just plug it in and see what happens.

occur
1[v] (formal) to happen:（正式）
When exactly did the incident occur?
Something unexpected occurred.

3、他一定习惯于没有汽车的生活，是吗？be used to doing sth 习惯于
4、can更多的表示一种能力（体会一下），may在句中当“可以”讲

1.不能！
be covered with一般较具体:
The mountain tops are covered with snow.