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saythewordstogetherquicklyTherearetalltreesnow.Module1Unit2some•houses•buses•trees•park•station•library•supermarketsbuildingsclassesteachersstudentsplaygroundslide滑滑梯be动词,情态动词,助动词与not的缩写be动词情态动词助动词am/couldcouldn'tdodon'tisisn'twouldwouldn'tdoesdoesn'tarearen'twillwon'tdiddidn'twaswasn'tcancan'twereweren'tshallshan't+not+not+not•必备词汇•1.be动词：am/is/are/was/were“是”•be动词用法口诀：•我(I)用am,你(you)用are,•现在单数用is，现在复数要用are,•过去单数用was，过去复数要用were。•2.情态动词:•能够can-could•将要will-would愿意•将要shall-should应当，应该•可能may-might•需要need,一定,必须must•3.助动词：•do用于一般现在时，谓语动词为原形•does用于一般现在时，谓语动词为第三人称单数•did用于过去时，谓语动词为过去式