It 作虛主詞的常見句型 @ 莓喵英文Fun

It 作虛主詞的常見句型

表示主觀意見價值判斷的形容詞如important（重要的）, necessary（必要的）, essential（必要的）, vital（極為重要的）, imperative（絕對必要的）, crucial（緊急的）, proper（適當的）, advisable（合情理的）, fitting（適當的）, urgent（迫切的）, natural（自然的）, traditional（傳統的）, resolved（決定的）,appropriate (適當的)，此類型的形容詞不論人稱或時態，動詞一律(Should)+VR

It is necessary that Mike (should) be punished by his parents.

It +be(not) +adj./N +(for sb/sth)+ to VR..

形容詞為修飾to VR後的事情 for人是指對某人而言

It is important for people to take good care of their health.

It+ be + adj.+ of+ sb + toVR..

形容詞若修飾的是人內心的狀態介系詞為of

It is very kind of you to help me with homework.

修飾人性形容詞（personal adjective）如：nice, good, wise, right, wrong, foolish, forward(上進的), generous, stingy(小氣), intelligent, kind, polite, ill-natured, careless, bold, brave, considerate(體貼的), thoughtful(考慮周到的), cruel, impudent(厚顏無恥), imprudent(魯莽), naughty, silly, rash(性急的), wicked, selfish, rude, unreasonable(無理性的，不懂道理的，不講理的), arrogant, ...etc.

optimistic 樂觀的courageous 勇敢的 honest 誠實的      witty 機智的
clever 聰明的adaptable 適應力強的humorous 幽默的    caring 關心人的
loyal 忠心的helpful 熱心助人的diligent 勤勉的      down-to-earth 實際的
diplomatic 圓滑的lively 活潑的outgoing 外向的     ambitious 雄心勃勃的
aspiring 向上的sincere 誠懇的compassionate 富同情心的straightforward 直率的jealous 善妒的impulsive 衝動的indecisive 優柔寡斷的        aloof 冷漠的fussy 挑剔的stubborn 固執的inflexible 死板的unreliable 不可靠的
forgetful 健忘的careless 粗心的superficial 膚淺的 stingy 小氣的
pessimistic 悲觀的quick-tempered 易怒的arrogant 傲慢的    possessive 佔有慾強的greedy 貪心的reckless 魯莽的bossy 愛指揮他人的   suspicious 多疑的

It+ takes/needs/requires+O+toVR

It needs no proof to show parents’ love for their children.

It is + N + to V

It is a pleasure to talk to you.

It + be + N/adj.+ V-ing

It is no use crying over spilt milk.

It is a waste of time arguing about the political issue.

It + is/was + N(P) + that-clause (此為關代句)
It is my uncle that cooks meals for his family, not my aunt.
It was last Sunday that the crowd staged a protest.

It + be (not) + adj. + that-clause . . .

此種以it作虛主詞的用法在英文中很常見。習慣上，英文句子的其他部分通常比主詞長，然而，如果主詞太長，往往會以it當虛主詞，而把真正的主詞往後移，以避免「頭重腳輕」的狀況。it作虛主詞時，後方的真主詞可以是不定詞、動名詞或名詞子句，而本課所介紹的是that所引導的名詞子句。請注意that子句當主詞時，不可以省略that。
另外，此句型多用來「表達事實」或「發表意見」。教師可以提醒學生一些常用於此句型的形容詞，像是clear、likely、sad、 important、possible、strange、interesting、 probable、true、certain、surprising等。

It is clear that the young man is lying.
It is likely that Andy will come to our place.
It is interesting that some people look like their pets.
除了that所引導的名詞子句，whether和how引導的子句也可以用於以it為虛主詞的句型中，例：