外研版英语九年级上册《We have celebrate the festival since the first pioneers arrived in America》Public holidays PPT课件(第2课时)
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外研版九年级英语上册《We have celebrate the festival since the first pioneers arrived in America》Public holidays PPT课件(第2课时),共20页。
since连词,意为“自······以来;······以后”,引导时间状语从句,主句常用完成时态,从句中的动词一般是短暂性动词,常用一般过去时态。
eg:He has worked there since it opened in 2001.自从2001年开业以来,他一直在那儿工作。
【拓展】①since还可用作介词,意为“自······以来;从······起”,与过去的某一时间点连用,如具体的年、月、日、钟点等。
eg:They have been here since October.自从10月以来,他们一直在这里。
②since用作连词时,还意为“既然;因为”,引导原因状语从句。
eg:Since you've come,we needn't go there.既然你来了,我们就没有必要去那里了。
lay动词,意为“摆放(餐具);安放;产(卵);下(蛋)”。其过去式与过去分词都为laid,为及物动词,其后必须接宾语。
eg:Mother laid the baby gently on the bed.母亲把婴儿轻轻放在床上。
【拓展】lie动词,作“躺;平放;位于”讲时,其过去式与过去分词分别为lay,lain;作“撒谎”讲时,其过去式与过去分词都为lied。
by介词,意为“通过······方式、途径、手段”,后常接名词、代词或动词-ing形式,对该短语提问应用how。
重点词组归纳
in the seventeenth century在17世纪
lay the table摆放餐具
as well也
wash the dishes洗餐具
plenty of丰富的;充足的
enjoy oneself玩得高兴
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