This book seemingly tells a story sounds like Alice's Advanture thing. It is supposed to help yonger, much youger kids, unlike me, to dig up the interests in reading.

Useful expressions, however, still could be found here and there within this book.

This story is about something that happened to them when they were sent away from London during the war because of the air-raids. 

1. air-raid 空袭

raid 突袭；搜捕

Though it may be an unfamiliar word to you but I belive you can have your best guess and make sure it is the meaning you guessed.

As soon as they had said good night to the Professor and gone upstairs on the first night, the boys came into the girls’ room and they all talked it over.

2. talk sth over

to discuss sth. with sb. because it will affect them, especially someone close to you.

[尤与亲近的人]讨论某事

“Do stop grumbling, Ed,” said Susan. “Ten to one it’ll clear up in an hour or so. And in the meantime we’re pretty well off. There’s a wireless and lots of books.”

3. grumble 

If someone grumbles, they complain about something in a bad-tempered way. 抱怨

“Nothing there!” said Peter, and they all trooped out again—all except Lucy.

4. troop out 离开[非正式]

There was nothing Lucy liked so much as the smell and feel of fur.

5. I like this feeling. Smell and feel of fur, must be something related to girls or adorable things.

“This must be a simply enormous wardrobe!” thought Lucy

6. enormous

adj.extraordinarily large in size or extent or amount or power or degree

This is an expression I'd never think of if Lucy doesn't say it.

“This must be a simply enormous wardrobe!” thought Lucy, going still further in and pushing the soft folds of the coats aside to make room for her.

7. fold

We know that fold can be used as a verb which means when you fold something say clothes, you put them in to good shapes, angular or rounded shapes. 

Here the soft folds means the coats that have been folded by someone. 

make room for

To give someone more space. 

“I wonder is that more moth-balls?” she thought, stooping down to feel it with her hand.

8. stoop

If you stoop, you bend your body forward and downward. 

The author used it at another place as well.

Then Mr. Tumnus stooped and took a flaming piece of wood out of the fire with a neat little pair of tongs,and lit a lamp. “Now we shan’t be long,” he said, and immediately put a kettleon.

Next moment she found that what was rubbing against her face and hands was no longer soft fur but something hard and rough and even prickly.

9. prickly adj.

Something that is prickly feels rough and uncomfortable, as if it has a lot of prickles. 扎人的 

Someone who is prickly loses their temper or gets upset very easily. 易怒的

Aprickly issue or subject is one that is rather complicated and difficult to discuss or resolve. 棘手的

She began to walk forward, crunch-crunch over the snow andthrough the wood toward the other light.

10. crunch

If something crunches or if you crunch it, it makes a breaking or crushing noise, for example, when you step on it.

If you crunch across a surface made of very small stones, you move across it causing it to make a crunching noise.

you crunch something hard, such as a sweet, or if it crunches, you crush it noisily between your teeth.

From this sentence, you learn how to say the act and sound when you step on the snow next time. Or when you crunch candies or crisps, the act and the sound can be easily described. 

As she stood looking at it, wondering why there was alamp-post in the middle of a wood and wondering what to do next, she heard a pitter patter of feet coming toward her.

11. pitter patter 噼噼啪啪的（地）啪哒啪哒声

N the sound of light rapid taps or pats, as of raindrops 

V to make such a sound 

ADV with such a sound 

You can use this phrase to describe the sound of raindrops tapping on the surface of sth. or someone walks with this sound.

From the waist upward he was like a man, but hislegs were shaped like a goat’s (the hair on them was glossy black) and instead offeet he had goat’s hoofs.

12. glossy

Glossy means smooth and shiny.

13. hoof

The hooves of an animal such as a horse are the hard lower parts of its feet.

One of his hands, as I have said, held the umbrella: inthe other arm he carried several brown-paper parcels.

14. parcel

A parcel is something wrapped in paper, in a bag or large envelope, or in a box, usually so that it can be sent to someone by mail.

If you say that something is part and parcel of something else, you are emphasizing that it is involved or included in it.j

e.g. Reading is part and parcel of my life and my growth.

Ah!” said Mr. Tumnus in a rather melancholy voice, “if only I had workedharder at geography when I was a little Faun, I should no doubt know all aboutthose strange countries. It is too late now.”

15. melancholy

adj & n

You describe something that you see or hear as melancholy when it gives you an intense feeling of sadness. 

He told about the midnight dances and how the Nymphs who lived in the wellsand the Dryads who lived in the trees came out to dance with the Fauns; aboutlong hunting parties after the milk-white stag who could give you wishes if youcaught him; about feasting and treasure-seeking with the wild Red Dwarfs indeep mines and caverns far beneath the forest floor; and then about summerwhen the woods were green and old Silenus on his fat donkey would come tovisit them, and sometimes Bacchus himself, and then the streams would run withwine instead of water and the whole forest would give itself up to jollificationfor weeks on end.

16. jollification

n.a boisterous celebration; a merry festivity

He merely took the handkerchief and kept on using it, wringing it out withboth hands whenever it got too wet to be any more use, so that presently Lucywas standing in a damp patch.

17. wring

twist and compress, as if in pain or anguish

twist, squeeze, or compress in order to extract liquid

If you wring something out of someone, you manage to make them give it to you even though they do not want to.

If someone wrings their hands, they hold them together and twist and turn them, usually because they are very worried or upset about something. You can also say that someone is wringing their hands when they are expressing sorrow that a situation is so bad but are saying that they are unable to change it.

I’m the sort of Faun to meet a poor innocent child in the wood, one that hadnever done me any harm, and pretend to be friendly with it, and invite it home tomy cave, all for the sake of lulling it asleep and then handing it over to the White Witch.

18. lull

If you are lulled into feeling safe, someone or something causes you to feel safe at a time when you are not safe.

“And if I don’t,” said he, beginning to cry again, “she’s sure to find out. And she’ll have my tail cut off, and my horns sawn off, and my beard plucked out,and she’ll wave her wand over my beautiful cloven hoofs and turn them intohorrid solid hoofs like a wretched horse’s.

19. have sth. done 

I like the sentence because it creates a vivid image of how the girl will be treated by the witch, and by doing so, it seemingly put the witch in front of me. 

Questions

“What do you mean?” cried Lucy, turning very white.

“You are the child,” said Tumnus. “I had orders from the White Witch that if ever I saw a Son of Adam or a Daughter of Eve in the wood, I was to catch them and hand them over to her. And you are the first I ever met. And I’ve pretended to be your friend and asked you to tea, and all the time I’ve been meaning to wait till you were asleep and then go and tell Her.”

“Oh, but you won’t, Mr. Tumnus,” said Lucy. “You won’t, will you? Indeed, indeed you really mustn’t.”

以前读书的时候老师讲 mustn't = not allowed to 禁止，不允许 ， 如果要说你不能怎么样，应该用can't

这里应该理解为小朋友用错，还是说其实mustn't 可以这么使用？