2019高考英语一轮复习Unit 22

XX高考英语一轮教学案大纲版

unit 22
理解:要点诠释
单词
1.prevent
讲: v. 妨碍；阻碍；防止；预防
例：we should do our best to prevent accidents.
我们应该尽力防止事故发生。
however,some psychologists warn that too much study can prevent a child from developing normally.
然而心理学家警告说学生负担太重会阻止孩子正常发育。
her sudden arrival prevented him(from)going out.
她突然来到使他不能外出。
链接•提示
    prevent sb. (from)doing=stop sb. (from)doing=keep sb. from doing 阻止某人做某事
    在主动语态中，使用stop或prevent时，可省略from，用keep时不可省略from，因为keep...doing的意思为“某人一直做”；在被动语态中都不可省略from。
练：—what _______ you to come to the party?
—an unexpected accident _______ me going.
a.prevented;forbad                            b.protected;forbad
c.forbad;prev