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There were many students taking part in the different activities of the Science and Technology Festival this year. 今年有很多学生参加了本次科技节的各项活动。 易混句式比较：There be sb./sth. to do sth.表示“有某人/某物将要做某事”。 There are no words to express the full measure of my gratitude. 任何语言都无法表达我的感激之情。 2．Our boat survived，and I was trying to recover when my elder brother put his mouth close to my ear，and screamed out the terrifying word “Whirlpool！” 我们的船获救了，我正竭力从恐惧中回过神来，就在这时，哥哥把他的嘴放到我的耳朵旁，大声说出那个令人胆战心惊的词“漩涡”。 (1)be doing ...when ...表示“正在……，这时……”，when在此句中意为“这时突然，就在这时”，是个并列连词。 (2)常见的类似结构还有： be about to do/on the point of doing ... when ... 正要……这时…… had just done ...when ... 刚做了……这时…… ①I was about to give up when my father came and encouraged me to keep going，(2017·福建高考书面表达) 就在我马上要放弃时，我的父亲来了，并鼓励我维持下去。 ②They had just covered three miles when they realized they left their IDS at home. 他们刚走了三英里，突然他们意识到他们的身份证忘在家里了。 [链接高考] (2011·浙江高考改编)One Friday，we were packing to leave for a weekend away when my daughter heard cries for help. [学以致用] Ⅰ.单句语法填空 1．This computer is worse than that one you bought last year，but it costs twice as much. 2．She had just finished her homework when her mother asked her to practise playing the piano yesterday. Ⅱ.完成句子 1．We were having a meeting when someone broke in. 我们正在开会，这时有人闯了进来。 2．①The earth is fortynine times as big as the moon. ②The earth is fortynine times the size of the moon. ③The earth is fortynine times bigger than the moon. 地球是月球的49倍大。 | 
