It 作虛主詞的常見句型：It+be+主觀意見價值判斷的形容詞+should +原型動詞
如： It is necessary that Mike (should) be punished by his parents.
以下表格中的單字為表示主觀意見價值判斷的形容詞，其在句型中的使用不論人稱或時態，動詞一律(Should)+VR
| 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） | resolved（決定的） |
| traditional（傳統的） | appropriate (適當的) |
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）
|
It |
be |
修飾人性形容詞 |
of |
人(受詞) |
to VR |
|
It |
is/was |
nice good right wise 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/魯莽) naughty silly rash(性急的) wicked selfish rude reckless 魯莽的 unreasonable(無理性的，不懂道理的，不講理的) arrogant 傲慢的 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 greedy 貪心的 suspicious 多疑的 superficial 膚淺的 stingy 小氣的 pessimistic 悲觀的 quick-tempered 易怒的 possessive 佔有慾強的 bossy 愛指揮他人的
|
of |
Cindy you her him them |
to do such thing |
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 做什麼是沒有用的~
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：
It is uncertain whether the vacancy will be filled soon.
It is amazing how Anne can collect so many stamps.
can't but VR /have no choice but to VR 無法選擇，不得不的用法
lead to / result in / bring about / cause /give rise to/ contribute to/ conduce to 用法
other than/besides/except/except for/aside from/apart from文法使用方式
雙重否定句 not,never,no without/butVR
assist/consist/resist/persist/insist/Persevere 用法
lest/for fear of /for fear that /in case of /in case/ in the case of 文法
There is no denying that or what how when 名詞子句
not to mention/not much of a 使用方法
nothing but/ anything but/ everything but 用法
As soon as /Once/ On+ v-ing/ Hardly when 一~就~文法
表雖然although /Much as/ Despite /In spite of 句型
as such/ as with/ as for /as of/as to
rise arise raise arouse 使用方式 notes
英文worth worthy worthwhile用法 notes
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