’t Р2、助动词(do,does,did)Р① do,does用于一般现在时,does用于第三人称单数,其他人称和数用do。其过去式did用于一般过去时。他们通常用在疑问句和否定句中。助动词后动词要用原形。Р如:Do you like this film? РDoes she like playing football?РI didn’t go to school yesterday.Р②否定形式:do not = don’t,does not =doesn’t,did not=didn’tР3、情态动词(can,may,must,should,will,would,shall等)Р情态动词表示说话人对某一动作或状态的态度,表示“可能”,“可以”,“需要”,“必须”,“应当”等意思。情态动词没有人称和数的变化,后面的动词要用原形。Р1)can和may都可以用来表示请求或允许,但may比can更正式,更客气些。Р如: Can I use your pen? May e in? Р2)must和should Р① must意为“必须,应当”,含有一种命令的语气,比较生硬,不容商量。Р② should意为“应当,应该”,表示建议或劝告,语气比较委婉,客气。Р 如:You must finish your homework before you go to bed.Р You should stay in bed and have a good rest. Р3)will和would用于疑问句,表示说话人向对方提出请求或询问,用would比will更委婉,更客气。如:Will you please open the window? Would you like some coffee? Р注意区别:РI’d like…我想要……(接名词) 如:I’d like some tea.
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