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英语语法——It用法
It用法 一.基本用法 二.形式宾语
1. v/v短语+it(形宾)+从句(when/that/if)‥ v : enjoy ,like,love ,dislike, appreciate, hate
v短语:don’t mind ; be found of ; feel like ; see to ; depend on ; insist on
2.v+it+as/to be+ noun/adj+从句（把...视为...） v: accept , consider , regard, take, see, view 3.v+it+to sb +that...
例如:owe it to sb that ...把...归功于... leave it to sb that...把...留给某人去做 take it to sb that...把...想当然 keep it in mind that... 把...放在心里 三.形式主语
1.It be ...when...当...的时候，是... 2.It be ...before...
主句表语多为表示时间段的词或短语，常译为“...之前”... 3.It be +一段时间+since...(变态句型) 如果主句是一般过去时，从句则用过去完成时 4.It doesn’t matter whether (if)...
whether (if)引导的从句是真主，常译为“不论(是否)...没关系” 5.It looks (seems) as if ...
it无意义，as if 引导状从，常译为“看起来，好像”如果与事实不符，则用虚拟
四.强调句型
1. It is/was +被强调部分+that(who)... 注意:①is或was永远单数
②只能用that连接，不得使用where ,when等连词，但被强调部分为人时，可用who(主格或宾格)和whom(宾格)代替that,用that也行。
③强调句中，也要注意主谓一致，人称一致和否定转移的问题 ④强调句中的be动词与情态动词的结合
2.It is not until +被强调成分+that ...“直到...才” 3.It is ...that...肯定句强调 Is it ...that...?一般疑问句强调 5W1H is it that...特殊疑问句强调 ...(主句)...5W1H it is that...从句强调 4.It指代that的句型 ①It is +adj+ that ...
adj: obvious ,true, possible ,certain 用虚拟necessary ,right ,strange ,natural ②It is +v-ed+ that
v-ed: reported , said ,learned
用虚拟suggested ,ordered ,demanded ,insisted ③It is a pity （a shame...）that...用虚拟
④It is time （about time /high time）that...该是...的时候 ⑤It is the first （second/third）time that...用现在完成时 ⑥It happens （seems/looks/appears）that 5.It指代to do/doing ①It takes sb...to do sth
②It is kind(表人的属性)（of sb）to do sth
→bad ,brave, careless, clever, cruel, foolish, stupid, wise, wrong
③It is necessary （for sb）to do sth
→important , necessary ,natural ,easy, safe, common , normal , hard ,difficult ④It is no good（use）doing sth 做...是无益（无用）的
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2023-12-28
