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1、 八上Unit1-Unit4必背知识清单 seem的用法seem+名词/形容词,“似乎是,好像是.”He seems a nice man.seem + to do sth.“似乎好像”She seems to be sleeping.It seems + that从句,“看起来好像.”It seems that it is going to rain right away.【拓展】seem to do sth.和It seems/seemed that/as if 从句,这两个句式可以互换It seems that he is very happy.=He seems to be very
2、happy.decide的用法decide(not)to do sth.决定（不）做某事decide on/upon(doing)sth.决定（做）某事decide+宾语从句decide+疑问词to do名词为decision, make a decision做决定try的用法try to do sth.尽力、设法做某事try doing sth.尝试做某事try ones best to do sth.尽某人最大努力做某事have a try试一试try on试穿常见频度副词辨析（always, usually, often, sometimes, hardly与never)频度副词一般用在
3、实义动词之前，be动词、助动词或情态动词之后。用百分比来表示频度副词的频率always usually often sometimes hardly never100% 90% 60% 40% 20% 0%（1)always“总是；永远”，语气最强，指在一切时候，没有例外（2)usually“通常”，很少有例外（3)often“往往；经常”，不如usually频繁，侧重动作发生的次数具有经常性，具体时间意味不强。（4)sometimes“有时”，表示动作偶尔发生（5)hardly“几乎不”，常和ever连用表示强调（6)never“从不”，其频率为零Its+adj.(+for/of sh.)+
4、to do sth,句式Its+adj. (+for/of sb.)+to do sth,意为“做某事（对某人而言）是的”, it是形式主语,后面的动词不定式为真正的主语。【拓展】在该句型中，若形容词（如 easy, important, necessary等）是对动作进行评价，则其后用介词for;若形容调（如 kind, friendly, nice, clever, foolish等）用来描述人的性格或品质，则其后用介词of.Its very nice of you to give away so much money to the school.Its difficult for us
5、to climb up the tree.辨析 both, all, neither与noneboth意为“两者都”，表达肯定意思Both of the twin sisters are good at dancing.all意为“全部”,用于表示“三者及三者以上全部”,表达肯定意思All the people applaud for him.neither意为“两者都不”，为both的否定形式，表达否定意思The old man has two sons, but neither of them lives at home.none意为“一个也没有”,为all的否定形式,用于表示“三者及以上
6、都不”,表达否定意思There are so many people here, but Im familiar with none of them.辨析beat与winbeat意为“打败；战胜”，后接战胜的对手，beat sb.意为“打败某人；赢了某人”He always beats me in tennis.win意为“赢得；获得”，后接某种比赛、奖品、荣誉或战争等，不能接参赛的选手They won the baseball game. as.as的用法（1)as+adj./adv.(原级）as.意为“与一样”，二者是同级比较，此时前一个as不能用so替换，其否定形式为not as/so+
7、adj./adv. (原级）as,意为“不如.”Toms book is as new as hers.Our vacation is not as long as yours.（2)若有修饰成分，如 twice, three times, half, a quarter等，则须置于第一个as之前Your bag is twice as expensive as mine. 辨析 give, provide 与offergive“递给，赠送，传递”，为普通意义上的“给予”give sb. sth give sth.to sb.offer“主动提出，自愿给予”，对方可接受也可拒绝offer sb.sth. offer sth. to sb.provide“提供，供应”，强调有预见，并通过储存等方式为某事做准备provide sth. for sb = provide sb. with sth.第 4 页 共 4 页学科网（北京）股份有限公司