情態(tài)動(dòng)詞動(dòng)詞分類實(shí)義動(dòng)詞：比如want、like、go等系動(dòng)詞：feel、taste、sound、look、smell（5個(gè)感官動(dòng)詞）等；助動(dòng)詞：do、does、did；will、shall；have、has等情態(tài)動(dòng)詞：can，should，must，may等定義表能力Icanplaybasketball表請(qǐng)求CanIleavenow?表必要Imuststudyhard.表建議Youshouldfinishyourhomework.情態(tài)動(dòng)詞的幾大特點(diǎn)1情態(tài)動(dòng)詞+動(dòng)詞原形2情態(tài)動(dòng)詞否定后面直接+not3情態(tài)動(dòng)詞變疑問(wèn)句，直接提前4情態(tài)動(dòng)詞無(wú)三單、無(wú)將來(lái)注意：haveto例外，用于第三人稱單數(shù)時(shí)變成hasto情態(tài)動(dòng)詞基本用法???序號(hào)原形過(guò)去式普通含義推測(cè)含義1maymight可能，也許可能，也許2cancould能力；請(qǐng)求/3can'tcouldn't不能，不可以不可能（100%確定）4willwould將要；一種意愿/5must/必須一定（100%確定）6mustn't/禁止/7need/需要/8needn't/不需要，不必/9should/應(yīng)該/10shouldn't/不應(yīng)該/情態(tài)動(dòng)詞表推測(cè)???can't100%否定推測(cè)不可能Shecan'tbeLucy.may不確定推測(cè)可能ShemaybeLucy.must100%確定推測(cè)一定ShemustbeLucy.情態(tài)動(dòng)詞辨析1.表能力can能力Icanplaybasketball.=Iamabletoplaybasketball.couldcan的過(guò)去式IcouldplaybasketballwhenIwasyoung.=IwasabletoplaybasketballwhenIwasyoung.beableto相當(dāng)于can/could/2.表請(qǐng)求委婉程度：can——could——may情態(tài)動(dòng)詞肯定回答否定回答canYes,youcan.

Ofcourse.No,youcan't

No,youmustn't(禁止)couldmay——Can/Could/MayIleavenow?

——肯定回答Yes,youcan/Ofcourse.

——否定回答No,youcan't/No,youmustn't3.表必要haveto“不得不/必須”客觀條件限制(被迫)don'thaveto“不必”=needn'tmust“必須”主觀條件限制(主動(dòng))musn't“禁止”注意：must引導(dǎo)的疑問(wèn)句情態(tài)動(dòng)詞肯定回答否定回答mustYes,youmust.No,youneedn't/No,youdon'thaveto——MustIfinishmyhomeworknow?

——是的，你必須現(xiàn)在完成。

——Yes,youmust.

——不，你不必現(xiàn)在完成。

——No,youneedn't/No,youdon'thaveto4.表建議shouldshould“應(yīng)該”shouldn't“不應(yīng)該”常用于糾正別人,提出或征詢建議hadbetterhadbetterdosth“最好（做某事）”hadbetternotdosth“最好不（做某事）”易混淆辨析maybe副詞，句首或者句末Maybesheisateacher.maybe情態(tài)動(dòng)詞+be,句中Shemaybeateacher.may情態(tài)動(dòng)詞，句中Shemaygotoshoptobuysomething.情態(tài)動(dòng)詞中的need1).need作情態(tài)動(dòng)詞用時(shí),needdosth需要做某事Ineedn'tgotheretooearly.2).need作實(shí)義動(dòng)詞用時(shí)，有人稱、時(shí)態(tài)和數(shù)的變化。needtodosth需要做某事Idon'tneedtogotheretooearly.3).need后面接doing表示被動(dòng)：sthneeddoing=sthneedtobedone.T