一、He had a shrewd suspicion that Dumbledore might have stepped in to stop Snape failing him on purpose.

1.結(jié)構(gòu)分析

本句是同位語從句，從句部分“Dumbledore might have … on purpose.”是對“suspicion”內(nèi)容的解釋。

2.重點語法

stop sb (from) doing sth 阻止某人做某事

類似表達還有：

prevent sb (from) doing

keep sb from doing sth(此處from不可省略,否則意義相反)

3.重點詞匯詞組

shrewd 判斷得準的，高明的

eg：I have a shrewd idea who the mystery caller was.

這個神秘的來訪者是誰，我能猜個八九不離十。

step in 介入，插手干預(yù)

eg：If no agreement was reached, the army would step in.

如果達不成協(xié)議，軍隊將會干預(yù)。

on purpose 故意地，成心地

eg：To be seen crying sadly, the little boy raised his head and had the tears falling down on purpose.

為了讓別人看見他哭得很傷心，小男孩抬起了頭故意讓眼淚掉下來。

二、Harry wouldn't have thought it possible that Snape's dislike for him could increase, but it certainly had.

1.結(jié)構(gòu)分析

本句是賓語從句，其中it是形式賓語，真正的賓語是that引導(dǎo)的“Snape's dislike … had”這句話。

2.重點語法

dislike for sb 不喜歡某人

【拓展】dislike的用法

①用作名詞時

have a dislike to doing sth

have a dislike for/of sb

take a dislike to sb

②用作動詞時

dislike sth

dislike doing sth

三、A muscle twitched unpleasantly at the corner of Snape's thin mouth every time he looked at Harry, and he was constantly flexing his fingers, as though itching to place them around Harry's throat.

1.結(jié)構(gòu)分析

本句是由and連接的兩個句子。

2.重點語法

itch to do sth 渴望做某事,恨不得

eg：My fingers itch to box his ears.

我手癢了，想給他一個耳光。

3.重點詞匯詞組

twitch v/n痙攣，抽搐

eg(v)：Her lips twitched with amusement.

她忍俊不禁地顫動著嘴唇。

eg(n)：She has a twitch in her left eye.

她左眼跳了一下。

flex 屈伸,活動(四肢或肌肉,尤指為準備體力活動)

eg：He slowly flexed his muscles and tried to stand.

他緩慢地活動了一下肌肉，想站起來。

as though 好像

eg：She smiled, as though solaced by the memory.

她笑了，仿佛在往事的回憶中得到了安慰。

【拓展】as though 和 as if的主要區(qū)別

as if從句可以使用省略語法，但as though不能.

eg：He sat there quietly as if (he was/were) sleeping.

他靜靜地坐在那里，好像睡著了。

四、This meant that the end of term feast took place amid decorations of scarlet and gold, and that the Gryffindor table was the noisiest of the lot, as everybody celebrated.

1.結(jié)構(gòu)分析

本句結(jié)構(gòu)為：主語+謂語+兩個that引導(dǎo)的賓語從句

2.重點詞匯詞組

scarlet 猩紅的

eg：She went scarlet with embarrassment.

她窘得滿臉通紅。