人教版英语九年级上册Unit12 知识点详解
Life is full of surprises and unexpected events that can catch us off guard。We never know what will happen next。and sometimes it can be XXX。it is important to stay positive and embrace the unexpected。as it can lead to new XXX.
2.By the time I woke up。my roommate had already left for work.当我醒来时，我的室友已经去上班了。
解析】by the time意为“在……之前”，表示一个动作在另一个动作之前完成。
典例精讲
①_____________________。the train had already left.(当我到达车站时，火车已经开走了。)②_____________________。XXX(到他打完电话时，他已经完成了作业。)
3.I offered to give her a lift to the airport.我主动提出捎她一程去机场。
解析】give…a lift意为“捎（某人）一程”，表示主动提供搭载某人的服务。
典例精讲
①Can you _________________________to the train n。(你能开车送我去火车站吗？)②I ___________________________to the supermarket。(我主动提出开车送她去超市。)
4.The alarm clock went off。and I rushed out of bed.闹钟响了，我立刻从床上跳起来。
解析】go off意为“响铃”，表示闹钟、警报等声音的响起。
典例精讲
①The fire alarm _________________________。and we had to XXX(火警警报响了，我们不得不撤离大楼。)②The time is up。The exam is over。The bell _________________________。(时间到了，考试结束了。铃响了。)
5.I was about to leave when my XXX.我正要离开，这时我的朋友赶到了。
解析】be about to意为“将要”，表示一个动作即将发生。
典例精讲
①I _______________________leave when my boss called me back。(我正要离开，这时我的老板叫我回去。)②The concert _______________________when the power went out。(音乐会即将开始，这时电力突然中断了。)delete in
6.I XXX at XXX.我怀疑地盯着那幅画看。
解析】XXX at意为“盯着……看”，表示长时间凝视某物。
典例精讲
①She ________________________the mirror for hours。trying on different outfits。(她长时间地盯着镜子，试穿不同的衣服。)②The child ________________________the candy in the store window。(孩子们盯着橱窗里的糖果看。)
7.The students lined up in a row and turned into the classroom.学生们成一排走进教室。
解析】in line with意为“成一排”，表示多个人或物在同一直线上排列。
典例精讲
①The soldiers ________________________and marched across the field。(士兵们成一排，穿过田野。)②The books ________________________on the shelf。XXX(书本按照作者排成一行，放在书架上。)
8.The plane took off。and I XXX.飞机起飞了，我感觉到了胃的下坠。
解析】take off意为“起飞”，表示飞机、火箭等从地面升空。
典例精讲
①The rocket ________________________into space。XXX(火箭升空，留下一道烟尘。)②The plane ________________________smoothly。and we were soon in the air。(飞机平稳地起飞了，很快就进入了空中。)
Tom is always late。so it wouldn't be a surprise if XXX。
I walked outside and realized that the bus had already left。"By the time" is used to indicate a point in the past up until a specific time ned in the clause。It is often used with the past perfect tense in the main clause。
Examples:
By the time I walked into the classroom。XXX.
By the time I got outside。the bus had already left.
By the time I locked the door。I realized I had left my keys at home.
Leave" is used to indicate leaving something at a specific n。while "et" is used to XXX something without a specific n。For example。"I left my book on the desk" versus "I XXX."

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