2020屆高考英語一輪復習精品學案――重點詞語辨析900例
as though：好像。等于as if。例如：
例844：he runs as though he were mad. （他跑起來像發瘋似的。）
4.when / while / as
when：當或在……的時候。從句中的動作可以表示某一段時間或某一時刻。例如：
例845：when we were at school, we went to the library every day.
例846：it was raining when we arrived.
while：當或在……的時候。表示主句中的動作在從句中的動作的進展過程中發生，只能指某一段時間。例如：
例847：please don’t talk so loud while others are working.
as：當或在……的時候。往往可與when或while通用，但它著重指主句和從句中的動作同時發生，有“一邊……，一邊……”含義。例如：
例848：the children sang happily as they went along the road.
1.比較幾組不定代詞
兩 者 三者或三者以上
都，全部 both all
都不，全部不 neither none
任一 either any
另一 the other another
每一 each（或兩者以上） every
相互 each other（或兩者以上） one another
例849：—which of the two ties will you take?
—i’ll take both, to give me a change sometimes.
例850：—will bill and tom be here tomorrow?
—i’m afraid neither, they have asked for leave.
例851：there are green trees on each side of the road. (= either side, both sides)
例852：—what would you like, coffee, coke or tea?
—any is ok.
2.each / every
each和every都是“每一”的意思。each強調個體，every強調全體；each可以接“of ”結構，可以在句中充當同位語，every則不可以；each指兩個或兩個以上的人或事物，every指三個或三個以上的人或事物；every有“每隔……，每……”之思，each則沒有。例如：
例853：each has his good point.
例854：each of them has his own dictionary.
例855：the students each have a desk. （此處each是the students的同位語。）
例856：i know every member of your family.
例857：we hand in our homework every three days. （相當于every third day。）
3.none / no one
none與no one都是“沒有”的意思。none表示人或物，可接of短語；no one只表示人，不接of短語。例如：
例858：—how many students are there in the classroom?
—none. （沒有學生，表示有特定對象“學生”。）
例859：—who is in the classroom?
—no one. / nobody. （沒有人，表示沒有特定對象。）
同樣情況也存在于none與nothing的比較：
例860：—how many pens are there in the box?
—none. （沒有鋼筆）
例861：—what’s in the box?
—nothing. （什么也沒有）
例862：none of them wants to go. （此處none不用no one替代。）
例863：every one of us / everyone has a chance to try a second time.