If的用法？ if的用法是什么？
\u82f1\u8bedIf\u7528\u6cd5\u662f\u4ec0\u4e48\uff1f1.
(\u8868\u793a\u6761\u4ef6)\u5982\u679c
,\u4e3b\u53e5\u7528\u5c06\u6765\u65f6\uff0cif\u4ece\u53e5\u7528\u73b0\u5728\u65f6\u8868\u793a\u5c06\u6765
He
will
come
if
you
invite
him.
\u5982\u679c\u4f60\u8bf7\u4ed6,\u4ed6\u4f1a\u6765\u7684\u3002
2.
(\u8868\u793a\u865a\u62df)\u5047\u5982,\u8981\u662f
1\uff09\u65f6\u6001\uff1a\u53ef\u4ee5\u8868\u793a\u8fc7\u53bb\uff0c\u73b0\u5728\u548c\u5c06\u6765\u7684\u60c5\u51b5\u3002\u5b83\u7684\u57fa\u672c\u7279\u70b9\u662f\u65f6\u6001\u9000\u540e\u3002
a.
\u540c\u73b0\u5728\u4e8b\u5b9e\u76f8\u53cd\u7684\u5047\u8bbe\u3002
\u53e5\u578b
\uff1a
\u6761\u4ef6\u4ece\u53e5
\u4e3b\u53e5
\u4e00\u822c\u8fc7\u53bb\u65f6
should(
would)
+\u52a8\u8bcd\u539f\u5f62
If
they
were
here,
they
would
help
you.
b.
\u8868\u793a\u4e8e\u8fc7\u53bb\u4e8b\u5b9e\u76f8\u53cd\u7684\u5047\u8bbe\u3002
\u53e5\u578b\uff1a
\u6761\u4ef6\u4ece\u53e5
\u4e3b\u53e5
\u8fc7\u53bb\u5b8c\u6210\u65f6
should(would)
have+
\u8fc7\u53bb\u5206\u8bcd
If
she
had
worked
harder,
she
would
have
succeeded.
The
rice
would
not
have
been
burnt
if
you
had
been
more
careful.
If
my
lawyer
had
been
here
last
Saturday,
he
would
have
prevented
me
from
going.
If
he
had
come
yesterday,
I
should
/
would
have
told
him
about
it.
\u542b\u4e49\uff1aHe
did
not
come
yesterday,
so
I
did
not
tell
him
about
it.
If
he
had
not
been
ill
and
missed
many
classes,
he
would
have
made
greater
progress.
\u542b\u4e49\uff1a
He
was
ill
and
missed
many
lessons,
so
he
did
not
make
greater
progress.
c.
\u8868\u793a\u5bf9\u5c06\u6765\u7684\u5047\u60f3
\u53e5\u578b\uff1a
\u6761\u4ef6\u4ece\u53e5
\u4e3b\u53e5
\u4e00\u822c\u8fc7\u53bb\u65f6
should+
\u52a8\u8bcd\u539f\u5f62
were+
\u4e0d\u5b9a\u5f0f
would
+
\u52a8\u8bcd\u539f\u5f62
should+
\u52a8\u8bcd\u539f\u5f62
If
you
succeeded,
everything
would
be
all
right.
If
you
should
succeed,
everything
would
be
all
right.
If
you
were
to
succeed,
everything
would
be
all
right.
3.
\u662f\u5426
=
whether
\u8fde\u63a5\u5bbe\u8bed\u4ece\u53e5
I
wonder
if
she
is
ill.
\u4e0d\u77e5\u5979\u662f\u5426\u75c5\u4e86\u3002
1.在条件状语从句中，从句用一般现在时，主句用一般将来时，切记从句必须用一般现在时，不能用将来时。 例如，if it is sunny tomorrow,I will go to swim.如果明天是晴天，我要去游泳。
2.在虚拟语气中，主句从句都必须用一般过去式，be必须用第二人称，即使主语是第三人称或第一人称. 例如，if I were you,I would travel.如果我是你，我会去旅游。再例如，if I had 1 million ,I would give it to charities.如果我有一百万，我会把它给慈善机构。
二丶if是"是否"得时候，只有一种用法
从句不必用一般现在时，可以用将来时，例如，I do not know if he will go to school tomorrow.意为我不知道明天他是否上学
绛旓細1. [琛ㄧず鏉′欢鎴栧亣璁綸濡傛灉锛涘亣濡傦紝鍊樿嫢锛岃鏄細渚嬪彞: If I knew, I would say.濡傛灉鎴戠煡閬擄紝鎴戝氨璇翠簡銆侷f I were you, I would have failed.濡傛灉鎴戞槸浣狅紝鎴戝彲鑳戒細澶辫触鐨勩2. 灏界锛涜櫧鐒讹紱鍗充娇锛氫緥鍙: If he is little, he is strong.浠栧敖绠″勾绾皬锛屽姏姘斿掕洰澶х殑銆侷f I am wrong, you ...
绛旓細(琛ㄧず鏉′欢)濡傛灉 ,涓诲彞鐢ㄥ皢鏉ユ椂锛宨f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 锛氭潯浠朵粠鍙 涓诲彞 涓鑸繃鍘绘椂 should(would)+鍔ㄨ瘝鍘熷舰 If...
绛旓細If I only knew! =If only I knew!.瑕佹槸鎴戠煡閬撶殑璇濊澶氬ソ!If I haven't lost my watch!.瑕佹槸娌′涪鎺夎〃璇ュ濂!(璇ユ,涓簡琛!)Why, if it isn't Mr. Smith!.鍡,閭ｄ笉姝ｆ槸鍙插瘑鏂厛鐢!B [寮曞闂存帴鐤戦棶鍙 鏄笉鏄 (whether)Ask him if it is true.闂粬閭ｆ槸涓嶆槸鐪熺殑 I wonder i...
绛旓細1. [琛ㄧず鏉′欢鎴栧亣璁綸濡傛灉锛涘亣濡傦紝鍊樿嫢锛岃鏄細渚嬪彞: If I knew, I would say.濡傛灉鎴戠煡閬擄紝鎴戝氨璇翠簡銆侷f I were you, I would have failed.濡傛灉鎴戞槸浣狅紝鎴戝彲鑳戒細澶辫触鐨勩2. 灏界锛涜櫧鐒讹紱鍗充娇锛氫緥鍙: If he is little, he is strong.浠栧敖绠″勾绾皬锛屽姏姘斿掕洰澶х殑銆侷f I am wrong, you ...
绛旓細涓涓if鏄滃鏋"鐨勬剰鎬濓紝鏈変袱绉嶇敤娉 1.鍦ㄦ潯浠剁姸璇粠鍙ヤ腑锛屼粠鍙ョ敤涓鑸幇鍦ㄦ椂锛屼富鍙ョ敤涓鑸皢鏉ユ椂锛屽垏璁颁粠鍙ュ繀椤荤敤涓鑸幇鍦ㄦ椂锛屼笉鑳界敤灏嗘潵鏃銆 渚嬪锛宨f it is sunny tomorrow,I will go to swim.濡傛灉鏄庡ぉ鏄櫞澶╋紝鎴戣鍘绘父娉炽2.鍦ㄨ櫄鎷熻姘斾腑锛屼富鍙ヤ粠鍙ラ兘蹇呴』鐢ㄤ竴鑸繃鍘诲紡锛宐e蹇呴』鐢ㄧ浜屼汉绉帮紝...
绛旓細鐢ㄦ硶鍙婂姩璇嶅舰寮 涓銆佽〃绀轰笌鐜板湪浜嬪疄鐩稿弽鐨勬儏鍐碉細浠庡彞锛If 涓昏+杩囧幓鏃(Be鍔ㄨ瘝鐢╳ere)涓诲彞锛氫富璇+should/would/could/might+do eg锛1锛嶪f I were you,I would take an umbrella.濡傛灉鎴戞槸浣狅紝鎴戜細甯︽妸浼炪傦紙浜嬪疄锛氭垜涓嶅彲鑳芥槸浣狅級2锛嶪f I knew his telephone number,I would tell you.濡傛灉鎴戠煡閬...
绛旓細1.寮曞瀹捐浠庡彞,鎰忎负"鏄惁"鐩稿綋浜巜hether I don't know if/whether she will come.鎴戜笉鐭ュス鏄惁浼氭潵銆2.寮曞鏉′欢鐘惰浠庡彞,鎰忎负"濡傛灉" ,琛ㄧず鏉′欢,涓诲彞鐢ㄥ皢鏉ユ椂锛宨f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3. 琛ㄧず涓绉嶈櫄鎷熷亣璁,寮曞铏氭嫙鏉′欢浠庡彞,鎰忎负鈥...
绛旓細if鐨勭敤娉曞涓嬶細1銆佽〃绀烘潯浠讹細濡傛灉銆涓诲彞鐢ㄥ皢鏉ユ椂锛宨f浠庡彞鐢ㄧ幇鍦ㄦ椂琛ㄧず灏嗘潵銆侶e will come if you invite him.2銆佹槸鍚︼細whether杩炴帴瀹捐浠庡彞銆侷 wonder if he is ill.3銆佽〃绀鸿櫄鎷燂細鍋囧锛岃鏄傛椂鎬侊細鍙互琛ㄧず杩囧幓锛岀幇鍦ㄥ拰灏嗘潵鐨勬儏鍐碉紝瀹冪殑鍩烘湰鐗圭偣鏄椂鎬侀鍚庛侫銆佸悓鐜板湪浜嬪疄鐩稿弽鐨勫亣璁俱備竴鑸繃鍘绘椂...
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 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 (寮曞鏉′欢浠庡彞) 濡傛灉 渚嬶細You can go if you want.濡傛灉浣犳兂璧板氨璧板惂銆(鐢ㄤ簬闂存帴鏄潪闂彞涓) 鏄惁 渚嬶細He 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傚父涓巆an銆乧ould銆乵ay銆乵ight绛夋儏鎬佸姩璇...
