高一英语：一二单元重难点短语归纳九
注意：① 当little不表示数量“少”而表示“小”的意思时，仍然 要用such。② 当so + adj. / adv. 或 such + n. 位于句首时，主句需要倒装。
【考例】 So difficult ____ it to live in an English-speaking country that I determined to learn English.
A. I have felt B. have I felt
C. I did feel D. did I feel
[考查目标] so + adj. 位于句首时，主句倒装。
[答案与解析] D A、C语序不对，排除。B时态不对。
3. One day Chuck is on a flight across the Pacific Ocean when suddenly his plane crashes. 一天，查克在飞越太平洋时.他的飞机突然坠毁了。
该句中的“when”表示“正在这时”，相当于and just或and at that time. 这时不能用while / as 替换。
常见句型：(1) be about to do sth when... (2) be doing sth when... (3) be on the point of doing sth when...
【考例】We were swimming in the lake ____ suddenly the storm started.
A. when B. while C. until D. before
[考查目标] "when" 作连词，表示“正在这时”。
[答案与解析] A 意为“我正在湖中游泳，突然暴风雨来了。”只有when才能用于这种句型。
4. He has to learn how to collect water, hunt for food, and make fire. 他不得不学会收集淡水.寻找食物，生火什么的。
该句中的“how I to collect...”为动词不定式短语作宾语。例如：We must decide which one to buy. 疑问词which, what, how, when, where等与小定式构成不定式短语。
【考例】 I've worked with children before, so I knew what ____ in my new job.
A. expected B. to expect C. to be expecting D. expects
[考查目标] what to do sth 不定式短语作宾语。
[答案与解析] B 该句需要填非谓语动词。排除A、D。句意为“以前我与孩子在一块儿工作过。因此我知道我的新工作需要什么。”C不表示进行，排除C。
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