2023年专升本考试正在进行中，库课小编为大家整理了专升本考前英语知识点的内容，还没有开考的同学可以记背下，有需要的同学可以收藏下，希望可以帮到大家。
专升本英语里那些介词知识
介词又叫前置词，是一种虚词。
介词分为三种，一种是简单介词，如 at, in, on, beside, to , for等;另一种是短语介词，即由两个以上的词组组成的短语，如 in front of, because of, out of, instead of 等;
还有一种叫二重介词，如 until、after、from、behind 等。
一、介词的句法功能
介词不能独立在句中做成份，介词后必须与名词、代词、或动名词构成介词短语在句中充当一个成份，表示人、物、事件等与其它人、物、事件等之间的关系。
1、作定语：The book on the table is mine.
This is his reply to your letter. 这是他给你的回信。
This is the best way of doing it. 这是做此事最好的方法。
2、作状语：We have breakfast at seven.(表时间);
They were late for meeting because of the heavy rain.(表原因);
They started the machine by pressing the button.(表方法) Don’t touch it with your hands. 别用手去摸它。
Did you do this by design or by accident? 你这样做是有意的还是无意的?
3、作表语：My dictionary is in the bag.
4、作宾语补足语：I found him in the office.
I found everything in good condition. 我发现一切正常。Her illness kept her in bed for a week. 她因生病在床上躺了一星期。
专升本英语里那些情态动词
情态动词有 can, could, may, might, must, should, ought to, need, dare, had better, would rather 等。情态动词相当于助动词，不
能单独使用，必须再接动词原型。
1.can, could 表示能力、允许、客观可能性。
注意：表能力时 could 是 can 的过去式;允许时 could 比 can 更委婉，表客观可能性时 could 可能性比 can 小。eg:She is only four, but she can read.
This sort of thing can't go on. I couldn't follow her speech. Could you lend me your bike?
Fire can't destroy gold.真金不怕火练
2.may, might 表示允许、猜测。
【注意】表允许时 might 比 may 更委婉;表客观可能性时 might 可能性 比 may 小 。eg:The dialect of one province may be quite different from that of the next one.
Students may not stay out after midnight without written permission. (stay out 在外边待的很晚)
He asked his mother if he might go out to play.
"May | open the window?" "Yes, please./ Please don't./ No, you
mustn't." (mustn't“不许、不准”)
3.must
1)表示可能性"肯定"、“准是” ，其否定形式是 can't
2)表示'必须"。must 只用在一般现在时和一 般将来时，此时must=have/has to,而 have to 可以用在任何时态。否定形式needn't
3)mustn't 表示"千万不要"、"一定不要”。eg:He must be a student. Teachers always tell us we must do everything step by step.
--Must I go tomorrow?
--No, you needn't (yes, l'm afraid so. must 一般疑问句的否定 needn't 来回答)
You mustn't talk like that to your parents
