2020高考英語備考單元知識搜索與探究歸納Unit12 Art and literature
【例題】 a large city is being set up in _______ was a small village.
a. what b. which c. that d. whore
解析:本題考查名詞性從句中what作引導詞的用法。what作引導詞引導名詞性從句時可以作動詞的賓語，也可以作介詞賓語。其本身也在從句中作主語或賓語等成分。
答案:a
歸納與遷移
名詞性從句中that與 what的區(qū)別
(1)that he was chosen made us very happy.(that在句中不充當成分，沒有含義)
(2)what we need is more time.（what在句中充當成分，有具體的含義）
要點2 be about to do...when句型
【例題】 he was about to tell me the secret ______someone patted him on the shoulder.
a. as b. until
c. while d. when
解析:本題考查結(jié)構(gòu) “be about to do sth....when...”。
答案:d
歸納與遷移
be going to與will/shall, be to do, be about to do的用法及區(qū)別：
(1)be going to 表示現(xiàn)在打算在最近或?qū)硪瞿呈拢@種打算往往經(jīng)過事先考慮，甚至已作了某種準備；
(2)shall/will do表示未事先考慮過，即說話時臨時作出的決定。be going to 表將來，不能用在條件狀語從句的主句中，而will則能，表意愿。
if it is fine, we’ll go fishing. (正確)
if it is fine, we are going to go fishing. (錯誤)
(3)be to do sth.表按計劃、安排即將發(fā)生的動作，還可表示吩咐、命令、禁止、可能性等。
a meeting is to be held at 3:00 o’clock this afternoon.
(4)be about to do sth.表示“即刻，就要”，后面不能接時間狀語或狀語從句。
autumn harvest is about to start.