20) this act would have been passed much earlier

　　(考點：同上)

　　21) the continued existence of the human race would be in jeopardy

　　(考點：同上)

　　22) lest he should awaken the baby

　　(考點：lest (以免)引導的從句通常用sb. should do的形式表示虛擬)

　　六、不定式

　　1) to complete a 24-story building in 10 months

　　(考點：不定式作主語時常用it作形式主語放在句首代替不定式，而將不定式移到謂語后面)

　　2) for us to have a good night’s sleep before the test

　　(考點：有時用“介詞for + 代詞/名詞”來表示不定式的邏輯主語，這時整句的謂語描述的對象是事情，這種情況下謂語中常用的形容詞有：necessary, important, possible, impossible, all right, essential等)

　　3) of you to donate so much money to the people in the disaster area

　　(考點：有時用“介詞of + 代詞/名詞”來表示不定式的邏輯主語，這時整句的謂語描述的對象是人，這種情況下謂語中常用的形容詞有：absurd, bold, brave, careful, careless, cowardly, cruel, foolish, generous, good, honest, kind, nice, polite, rude, selfish, silly, stupid, thoughtful, thoughtless, wicked, wise, wrong等)

　　4) not to punish those students who had been late for class

　　(考點：1. 用不定式結構作decide的賓語;2.不定式的否定形式是在to前加not)

　　(能帶不定式作賓語的動詞常見的有：afford, agree, ask, attempt, beg, begin, bother, care, choose, claim, consent, decide, demand, desire, dislike, endeavor, expect, fail, fear, forget, happen, hate, help, hesitate, hope, intend, learn, like, love, manage, mean, neglect, offer, plan, pledge, prefer, prepare, pretend, promise, refuse, remember, resolve, start, threaten, undertake, venture, volunteer, vow, want, wish)

　　5) whether to visit their son in France

　　(考點：“疑問詞+不定式”作動詞wonder的賓語。能以這種結構作賓語的動詞通常有ask, consider, decide, discover, explain, forget, guess, know, learn, observe, remember, see, tell, understand, wonder等)

　　6) warned me just now not to water flowers at noon

　　(考點：不定式作賓語補語)

　　7) invited him to give us a lecture on modern art

　　(考點：同上)

　　(能帶不定式結構作賓語補語的動詞有advise, allow, ask, beg, cause, challenge, command, compel, enable, determine, encourage, expect, feel, find, force, get, hate, have, hear, help, inform invite, let, like, make, mean, need, notice, notify, oblige, order, permit, persuade, remind, request, require, see, send, teach, tell, tempt, trouble, urge, want, warn, watch, wish等。注：劃線的動詞后面的不定式不帶to)

　　8) to be the chairman of students’ union in so large a university

　　(考點：動詞 + it + 形容詞/名詞 + 不定式。it是形式賓語，不定式是真正賓語)

　　9) to apply what we have learned in class to practice

　　(考點：不定式作定語)

　　(不定式常用作以下名詞/代詞的定語：ability, ambition, anything, attempt, capability, chance, curiosity, desire, decision, determination, effort, failure, intention, need, nothing, opportunity, place, plan, promise, reason, right, something, tendency, time, way, wish等)

　　10) ruined our plan to show the film in the open air

　　(考點：同上)

　　11) the decision to build a nuclear power station in the suburbs

　　(考點：同上)

　　12) American woman to explore the outer space

　　(考點：由only, last, next，序數詞或形容詞最高級修飾的名詞常用不定式作定語)

　　13) only to drop it on their own feet

　　(考點：不定式作結果狀語)

　　14) to meet a high school classmate in the mountain village

　　(考點：不定式作原因狀語)

　　15) to have taken up so much of your time

　　(考點：1. 不定式作原因狀語;2. 不定式的完成時)

　　16) to be standing in the doorway when he rushed in

　　(考點：不定式的進行式)