为什么need有些时候否定形式do(es) not need ，而有时候为needn't？什么情况下用哪个呢？是否有使用诀窍？ need的否定形式什么时候该用needn't什么时候该用do...
need\u7684\u5426\u5b9a\u53e5\u4ec0\u4e48\u65f6\u5019\u662fneedn\u2019t\u4ec0\u4e48\u65f6\u4f60\u597d\uff0cneed\u53ef\u4ee5\u505a\u52a8\u8bcd\uff0c\u4e5f\u53ef\u4ee5\u505a\u60c5\u6001\u52a8\u8bcd\u3002 \u5982\u679cneed \u662f\u5b9e\u4e49\u52a8\u8bcd,\u5373\u9700\u8981\u4ec0\u4e48\u4e1c\u897f\u65f6,\u4f7f\u7528don't need\u3002\u5982\u679c\u662f\u60c5\u6001\u52a8\u8bcd,\u5c31\u7528needn't\u3002\u4f60\u770b\u53e5\u5b50\u4e2d\u6709\u6ca1\u6709\u5176\u4ed6\u52a8\u8bcd\u76f4\u63a5\u52a0\u5728need\u540e\u9762\uff0c\u6709\u7684\u8bddneed\u5c31\u662f\u60c5\u6001\u52a8\u8bcd\u3002\u53d8\u6210neednt\u3002
I need a bag. I don't need a bag.\u6211\u9700\u8981/\u4e0d\u9700\u8981\u4e00\u4e2a\u5305\u3002
I need buy a bag. I needn't buy a bag.\u6211\u9700\u8981/\u4e0d\u9700\u8981\u53bb\u4e70\u4e00\u4e2a\u5305\u4e86\u3002
needn't\u548cdon't need\u90fd\u662f\u5426\u5b9a\u7684\u610f\u601d\uff0c\u4f46\u662f\u4e8c\u8005\u7528\u6cd5\u4e0d\u540c\uff1a
needn't\u662f\u60c5\u6001\u52a8\u8bcd\u7684\u5426\u5b9a\u5f0f\uff0c\u540e\u9762\u52a0\u52a8\u8bcd\u539f\u5f62\u3002
don't need\u662f\u5b9e\u4e49\u52a8\u8bcd\u7684\u5426\u5b9a\u5f0f\uff0c\u540e\u9762\u52a0to do\u4e0d\u5b9a\u5f0f\u3002
need作为实义动词时和普通动词一样，否定用don't need；
need作为情态动词时比较特殊，用needn't形式。（与其他情态动词“can”，“may”，“must”的用法基本相同。）
所以关键就是判断是作为情态动词还是实意动词用。
若need后边加的是动词原形，则为情态动词；若加的是to do，则为实意动词。
所以关键在于根据need后接的是什么，判断need在句中是实意动词还是情态动词，然后就用don't need或者 needn't。
希望对你有所帮助！
do(es) not need 是表示不需要，而needn't是说一定不要
绛旓細need鐨勫惁瀹氬舰寮鏄痭eedn't/don'tneed锛屾剰鎬濇槸涓嶅繀/涓嶉渶瑕併備緥濡傦細Youneedn'ttroubleaboutthat銆備綘涓嶅繀涓鸿繖璐逛簨浜嗭紱Idon'tneed towork銆傛垜涓嶉渶瑕佸伐浣溿俷eed鐨勭敤娉:need鐢ㄤ綔鎯呮佸姩璇嶆椂锛屽畠娌℃湁浜虹О銆佹暟鍜屾椂鎬佺殑鍙樺寲锛屼竴鑸彧鐢ㄤ簬鐤戦棶鍙ユ垨鍚﹀畾鍙涓紝鍏跺悗鎺ュ姩璇嶅師褰紝鍗硁eeddosth锛屽叾鍚﹀畾寮鏄痭eedn't銆傜枒闂...
绛旓細娉ㄦ剰锛歮ust寮曞鐨勪竴鑸枒闂鍙ョ殑鍚﹀畾鍥炵瓟蹇呴』浣跨敤 needn't銆傚锛氾紞-Must I leave? 鎴戝繀椤荤寮鍚?锛-No锛寉ou needn锛噒.涓嶏紝浣犱笉蹇呯寮銆備簩銆need浣滃疄涔夊姩璇嶇殑鐢ㄦ硶锛堥氬父浠ヤ互涓嬪浐瀹氭惌閰鐨勫舰寮鍑虹幇锛夛細need鐢ㄤ綔瀹炰箟鍔ㄨ瘝鏃讹紝鏈変汉绉般佹暟鍜屾椂鎬佺殑鍙樺寲銆傛瀯鎴愮枒闂彞鍜鍚﹀畾鍙瑕佸熷姪do/does/did 1銆乻b need锛...
绛旓細浣犺鐨涓嶅 need鍚庨潰涓鑸+to 浣跨敤 搴旇鏄痷 dont need to do sth鍜寀 need not to do sth needn't to do涓璶eed 鏄綋浣"can ,may,must"涓绫荤殑鎯呮佸姩璇嶄娇鐢 鑰 dont need to do涓 "need"鏄綋浣滃姩璇嶆潵鐢ㄧ殑,鍚﹀畾鏃瑕+涓诲姩璇 do 姣斿 鎴戜笉闇瑕佸幓涔颁竴杈嗚溅 i needn't to buy a car for my...
绛旓細Need he stay here锛熶粬鏈夊繀瑕佺暀鍦ㄨ繖鍚椼傛儏鎬佸姩璇峮eed鏋勬垚鐨.鐤戦棶鍙ャ俌ou needn't do it again锛庢剰鎬濇槸浣犱笉闇瑕侀噸澶嶅仛浜嗐備綔涓烘儏鎬佸姩璇峮eed鐢ㄤ簬鍚﹀畾缁撴瀯涓紝鎰忔濇槸涓嶅繀锛屽彞寮忔槸need鐨勫惁瀹氬舰寮+鍔ㄨ瘝鍘熷舰锛屽湪涓鑸枒闂彞鐨勫洖绛斾腑锛岃偗瀹氱敤must锛屽惁瀹氱敤needn't 銆傚綋need涓烘儏鎬佸姩璇嶆椂锛岃〃绀哄繀瑕侊紝鍚﹀畾涓簄eedn...
绛旓細don't need涓鐨刵eed鏄疄涔夊姩璇嶏紝needn't涓殑need鍒欐槸鎯呮佸姩璇嶃俷eedn't鏄儏鎬佸姩璇鐨勫惁瀹氬紡锛宒on't need鏄姩璇嶇殑鍚﹀畾寮忥紝need鏃㈠彲鐢ㄤ綔鎯呮佸姩璇嶏紝涔熷彲鐢ㄤ綔瀹炰箟鍔ㄨ瘝銆1.needn't 鏄綋need 浣滄儏鎬佸姩璇鏃剁殑鍚﹀畾褰㈠紡,2.褰撲綘鐢∕ust鎻愰棶鏃,鍙互鐢╪eedn't 浣滃惁瀹氬洖绛3.褰撶敤浜庝竴鑸椂,don't need 鍙互鍜...
绛旓細涓銆乶eed浣滄儏鎬佸姩璇嶇殑鐢ㄦ硶锛氾紙1锛塶eed鐢ㄤ綔鎯呮佸姩璇嶆椂琛ㄢ滃繀椤汇佸繀瑕佲,鍚庣洿鎺ヨ窡鍔ㄨ瘝鍘熷瀷,need+do锛鍚﹀畾needn鈥檛 +do 锛2锛塶eed鏃犱汉绉般佹暟鐨勫彉鍖栵紙绗笁浜虹О鍗曟暟涓嶅姞s锛,涔熸病鏈夐潪璋撹褰㈠紡锛堜笉瀹氬紡銆佸垎璇嶏級.锛3锛夋敞鎰:need鐢ㄤ綔鎯呮佸姩璇嶆椂甯哥敤浜鍚﹀畾鍙鍜岀枒闂彞涓.锛4锛塵ust寮曞鐨勪竴鑸枒闂鍙ョ殑鍚﹀畾...
绛旓細涓銆乶eed浣滄儏鎬佸姩璇嶇殑鐢ㄦ硶锛氾紙1锛塶eed鐢ㄤ綔鎯呮佸姩璇嶆椂琛ㄢ滃繀椤汇佸繀瑕佲,鍚庣洿鎺ヨ窡鍔ㄨ瘝鍘熷瀷,need+do锛鍚﹀畾needn鈥檛 +do 锛2锛塶eed鏃犱汉绉般佹暟鐨勫彉鍖栵紙绗笁浜虹О鍗曟暟涓嶅姞s锛,涔熸病鏈夐潪璋撹褰㈠紡锛堜笉瀹氬紡銆佸垎璇嶏級.锛3锛夋敞鎰:need鐢ㄤ綔鎯呮佸姩璇嶆椂甯哥敤浜鍚﹀畾鍙鍜岀枒闂彞涓.锛4锛塵ust寮曞鐨勪竴鑸枒闂鍙ョ殑鍚﹀畾...
绛旓細浜屻need鐨鐢ㄦ硶锛1锛巒eed鐢ㄤ綔鎯呮佸姩璇嶆椂锛屽畠娌℃湁浜虹О銆佹暟鍜屾椂鎬佺殑鍙樺寲锛屼竴鑸彧鐢ㄤ簬鐤戦棶鍙ユ垨鍚﹀畾鍙涓紝鍏跺悗鎺ュ姩璇嶅師褰紝鍗硁eed do sth锛庯紝鍏鍚﹀畾寮鏄痭eedn't锛岀枒闂紡鏄皢need鎻愬埌鍙ラ銆傚锛歒ou needn't give it back before Friday锛庝綘鍦ㄦ槦鏈熶簲鍓嶄笉蹇呰繕鎴戙Need you go so soon锛熶綘闇瑕佽繖涔堝揩灏...
绛旓細don't need to do.need to do sth銆乶eed sth 涓鐨刵eed鏄疄鎰忓姩璇嶏紝琛ㄧず闇瑕佸仛鏌愪簨锛鍚﹀畾褰㈠紡鏄湪璋撹鍔ㄨ瘝鍓嶅姞鍔╁姩璇嶈繘琛屽惁瀹氥備緥锛氣憼I need to eat some fruits. 鎴戦渶瑕佸悆涓浜姘存灉銆傚惁瀹氾細I don't need to eat any fruits. 鎴戜笉闇瑕佸悆姘存灉銆傗憽I need some fruits to eat. 鎴戦渶瑕佷簺姘存灉鏉...
绛旓細涓夈佸湪鍚﹀畾鍙 涓,鍙互鐢need鐨勫惁瀹氬舰寮+涓嶅畾寮 瀹屾垚浣撱備緥濡: 1.We needn't have worried.鍏跺疄鎴戜滑涓嶅繀瑕佹厡銆 2.You needn't have mentioned it.浣犳湰鏉ヤ笉蹇呮彁璧疯繖浠朵簨銆 3.You needn't have said that when he asked.褰撲粬闂鐨勬椂鍊,浣犲叾瀹炰笉蹇呰璇淬 鈥渘eed鈥濅綔涓哄疄涔夊姩璇 鏃,閫氬父鐢ㄦ硶鏄: 浜+need +...
