It seems impossible that he will be here tomorrow. (3).seem常用于由as if/though引导的从句中，如：
It seems as if it is going to rain. It seems as if he knew nothing about that.
[注]在这种句式中，如从句所叙述的情实现的可能性比较大，从句谓语用陈述语气 若实现的可能性较小，或根本不可能实现，从句的谓语则用虚拟语气。
(4).seems也常用在―there seem(s) to be‖句式中，用来代替be，作句子的谓语。如： There seems to be no point in refusing.
There seemed to be something the matter with him. at an altitude of = at a height of 在海拔……米处
e.g. The plane is flying at a height / altitude of 10,000 feet. 注意:at 在此处表 ―在……处/时, 以……‖后接年龄, 速度, 长宽深高, 价格, 费用等 在…岁时at the age of 以..的价格at a high / low price
在….深度\\宽度处at a depth/width of 在…距离处at a distance of 9、and it would be very cold…
主语 + be + adj.+ to do sth. 是一常用句式即不定式用主动形式表达被动含义。不定式和主语之间是动宾关系，应使用及物动词的主动形式，若是不及物动词，要加相应的介词。 常用的形容词有：easy, difficult, hard, inter
esting, pleasant, nice ,dangeroues, important等； 该句型可以转换成―It + be + adj + to do sth.‖结构
eg：The problem is really hard to work out. = It is really hard to work out the problem.
还有一类表示心理活动的形容词(surprised, moved, disappointed, pleased, happy, sad, delighted, sorry, interested, glad, worried, eager, anxious, angry等），主动用to do, 被动用to be done, 也可接从句。
We were both surprised to learn that half of the river is in China. 我们惊奇地发现这条河有一半是在中国境内。
We were disappionted to be told that the match had been put off. 10. Once she has made up her mind, nothing can change it. Finally, I had to give in.她一旦下了决心，什么也不能使她改变。最后，我只好让步了。
once 作为连词，作―一(旦)……就……‖解，连接一个表示时间的状语从句。从句中常用一般现在时，现在完成时表将来。
如：Once you have begin you must continue. Once printed，the book will be very popular once 用作副词，意为―一次；从前，曾经‖。 11、
(1)、give in (to sb./sth.) 屈服于, 让步, 递交
eg：He had to give in to my views. 他只好顺从了我的意见。 （2）、give in (sth. to sb.) 上交
eg：Please give your examination papers in to the teacher. 【拓展】give up 放弃, 认输 give out 筋疲力尽；分配 give away 捐赠, 泄露 give off 放出，散发（光、热、烟、气、味等）
运用：用适当的介词或副词填空。 （1） He gave ____ to her request.
（2） If you give _____ smoking，you will save a lot of money every year.
（3） His accent gave him _____ . So I knew he was from USA. （4）Our teacher gave ______ to the police station what he picked up from the ground.
（5） His money soon gave ______ because he bought a lot of things.
12、It becomes rapids as it passes through deep valleys, traveling western Yunnan
Province.
【辨析】 across，through与over
across表示从一定范围的一边到另一边或事物交叉位置,―横穿, 横跨‖表面
through 表达两边穿过或穿过空间内部
over表示 ―越过‖ 是指越过较高的物体从一侧到另一侧 She swam across the river. 她游过河去。
The river flows through the city from west to east. 这条河从西往东流过城市。
The thief climbed over the wall and ran away. 小偷翻过墙逃走了。 Part 3. Learning about Language
1、 A determined person always tries to finish the job,no matter how hard it is.
有决心的人总是努力完成工作，而不管它有多难。 疑问词+ever，no matter+疑问词
（1）whatever,whichever,whoever,whomever可以引导让步状语从句，也可以引导名词性从句，引导让步状语从句时，可以换成no matter what/which/who/whom,位置可以在主句前，也可以在主句后。
Take whatever you want. 拿你想要的任何东西。
We will complete the work on time, no matter what happens. =Whatever happens, we will complere the work on time.
（2）wherever,whenever,however常引导让步状语从句，可以换成no mattewhere/when/how,可放在主句前或主句后。
Whenever he goes abroad, he will buy presents for his younger sister.
=No matter when he goes abroad, he wil by presents for his younger sister.
2.except for, except, but, besides
表示―除了‖的词或短语有：except; but; except for; besides; except that /when...等。
(1) except 和 but 都表示―除了……之外。没有‖，二者大多数情况下可以互换；但在no, all, nobody, nothing, no one 等不定代词后多用 but。No one knows our teacher's address except / but him. (排除him)
(2) besides 除……之外，还……，有附加性。What other foreign languages do you know besides English? (English与other languages都属于know的范围)
(3) except for 只不过……，整体肯定，部分修正，用于排除非同类事物，for表示细节上的修正。 Your article is well written except for a few spelling mistakes.