if的用法有哪些?
if的用法如下：
1、表示条件：如果。主句用将来时，if从句用现在时表示将来。
He will come if you invite him.
2、是否：whether连接宾语从句。
I wonder if he is ill.
3、表示虚拟：假如，要是。时态：可以表示过去，现在和将来的情况，它的基本特点是时态退后。
A、同现在事实相反的假设。
一般过去时should(would)+动词原形：If they were here,they would help you.
B、表示于过去事实相反的假设。
过去完成时should(would)have+过去分词：If she had worked harder,she would have succeeded.
C、表示对将来的假想。
一般过去时should+动词原形：If you succeeded,everything should be all right.
were+不定式would+动词原形：If you should succeed,everything would be all right.
should+动词原形：If you were to succeed,everything should be all right.
绛旓細渚嬶細I wonder if you'd be kind enough to give us some information, please?涓嶇煡鑳藉惁璇锋偍鍚戞垜浠彁渚涗簺淇℃伅锛(寮曞浠庡彞锛屾彁鍑烘瑕佺殑浜嬪疄) 鍗充娇 渚嬶細If there was any disappointment it was probably temporary.鍗充娇鏈変换浣曢仐鎲撅紝鍙兘涔熸槸鏆傛椂鐨勩(灏ゆ寚涓嶈兘瀹炵幇鐨勬効鏈) 瑕佹槸鈥﹀濂 渚嬶細If only ...
绛旓細渚嬪彞锛欻e asked us if English is our major subject. 浠栭棶浜嗘垜浠嫳璇槸涓嶆槸鎴戜滑鐨勪富瑕佽绋嬨3銆佺敤浠ヨ〃绀轰笌浜嬪疄鐩稿弽鐨勬効鏈涖備緥鍙ワ細If he were in Tianjin now! 瑕佹槸姝ゅ埢浠栧湪澶╂触澶氬ソ鍟婏紒4銆乮f 鐢ㄤ簬鏉′欢鐘惰浠庡彞锛屽叾涓湁鐪佺暐鎴愬垎銆備緥鍙ワ細If (it is) necessary we shall put the video conference...
绛旓細conj.濡傛灉, 鍋囧 If only I had gone by taxi.鍋囪嫢鎴戞槸涔樿绋嬭溅鍘荤殑灏卞ソ浜嗐侷f necessary, give me a ring.濡傛灉闇瑕, 鎵撲釜鐢佃瘽缁欐垜銆侷f ever eyes could speak, hers did very plainly.濡傛灉璇寸溂鐫涜兘璇磋瘽, 濂圭殑鐪肩潧鍙寰楁竻妤氭瀬浜嗐傛槸鍚 I will see if he wants to talk to you.鎴戝幓浜嗚В...
绛旓細if寮曞鐨勬潯浠剁姸璇粠鍙ョ殑鍒嗙被鍙婅櫄鎷熸潯浠跺彞鐨勫垽鏂 1銆佸彲浠ユ妸鏉′欢鍙ュ垎涓轰袱绫伙細1).鐪熷疄鏉′欢鍙ワ紙Sentences of Real Condition锛夛細鍑℃槸鍋囪鐨勬儏鍐靛彂鐢熸у彲鑳藉緢澶,灏辨槸鐪熷疄鏉′欢鍙.渚嬪锛氣懘銆If I have time ,I will help you with this work.濡傛灉鎴戞湁鏃堕棿浼氬府鍔╀綘鍋氭宸ヤ綔鐨.鈶点丄s long as I say ...
绛旓細1. if 鐢ㄤ簬鏉′欢鐘惰浠庡彞涓潵銆傚锛2. if only 鈥滆鏄︹.灏卞ソ浜嗏濓紱鈥滀絾鎰库︹︹3. if 鐢ㄤ簬铏氭嫙璇皵鐨勬潯浠剁姸璇粠鍙ヤ腑 4. what if 鈥 瑕佹槸鈥︹.鎬庝箞鍔烇紵5. as if 濂藉儚 6.if 鐢ㄤ簬瀹捐浠庡彞锛屸滄槸鍚︹
绛旓細if浣滀负浠庡睘杩炴帴璇嶏紝鏈変袱绉鐢ㄦ硶銆備竴銆佸仛鈥滄槸鍚︹濊В閲婏紝寮曞鍔ㄨ瘝鐨勫璇粠鍙ワ紝鍚庤窡闄堣堪鍙ョ殑璇簭锛岀浉褰撲簬涓鑸枒闂彞銆傚畠寮曞鐨勫彞瀛愶紝鎸夌収鏃堕棿鏉ラ夋嫨鏃舵併傚锛欻e asked if I had left with you, and I said no.浠栭棶鎴戞槸鍚﹀拰浣犱竴鍧楀効绂诲紑鐨勶紝鎴戣涓嶆槸銆侷 wonder if I might have a word with Mr ...
绛旓細杩炶瘝 锛堣〃鏉′欢锛夊鏋滐紱鍗充娇锛涙槸鍚︼紱锛堣〃鍋囪锛夊亣濡 鍩烘湰閮借兘鐢ㄨ繃鍘诲紡锛屼絾鏈夊嚑澶勬槸蹇呴』鐢ㄧ殑銆備緥锛歒ou can go if you want.濡傛灉浣犳兂璧板氨璧板惂銆備緥锛欻e asked if I had left with you, and I said no.浠栭棶鎴戞槸涓嶆槸鍜屼綘涓璧风寮鐨勶紝鎴戣涓嶆槸銆係he understood his meaning, if not his w...
绛旓細鐢ㄦ硶 1銆if浣滀负杩炶瘝锛屽紩瀵兼潯浠剁姸璇粠鍙ワ紝琛ㄧず鍋囧锛屽鏋滅瓑銆傚湪澶嶅悎鍙ヤ腑濡傛灉涓诲彞鐢ㄥ皢鏉ユ椂锛屽垯if寮曞鐨勭姸璇粠鍙ョ敤涓鑸幇鍦ㄦ椂銆備緥鍙ワ細If it rains(浠庡彞)锛孖 will stay at home锛堜富鍙ワ級=I will stay at home if it rains.濡傛灉涓嬮洦锛屾垜浼氬緟鍦ㄥ閲屻侶e will come if you invite him.濡傛灉浣犺浠栵紝浠...
绛旓細涓銆if浣滀负杩炶瘝锛屽紩瀵兼潯浠剁姸璇粠鍙ワ紝琛ㄧず鈥滃亣濡傗濄佲滃鏋溾濈瓑鎰忔濄傚湪澶嶅悎鍙ヤ腑濡傛灉涓诲彞鐢ㄥ皢鏉ユ椂锛屽垯if寮曞鐨勭姸璇粠鍙ョ敤涓鑸幇鍦ㄦ椂銆備緥濡傦細If you ask him锛宧e will help you.濡傛灉浣犳眰浠栵紝浠栧皢浼氬府鍔╀綘銆備簩銆乮f鍙互寮曞璁╂鐘惰浠庡彞锛岃〃绀衡滃嵆浣挎槸鈥濄佲滆櫧璇粹濅箣鎰忋備緥濡傦細If I am wrong锛寉ou are...
绛旓細1. (琛ㄧず鏉′欢)濡傛灉 ,涓诲彞鐢ㄥ皢鏉ユ椂锛if浠庡彞鐢ㄧ幇鍦ㄦ椂琛ㄧず灏嗘潵 He will come if you invite him.濡傛灉浣犺浠,浠栦細鏉ョ殑銆2. (琛ㄧず铏氭嫙)鍋囧,瑕佹槸 1锛夋椂鎬侊細鍙互琛ㄧず杩囧幓锛岀幇鍦ㄥ拰灏嗘潵鐨勬儏鍐点傚畠鐨勫熀鏈壒鐐规槸鏃舵侀鍚庛俛. 鍚岀幇鍦ㄤ簨瀹炵浉鍙嶇殑鍋囪銆傚彞鍨 锛 鏉′欢浠庡彞 涓诲彞 涓鑸繃鍘绘椂 should( would) +...
