2020屆高考英語一輪復(fù)習(xí)精品學(xué)案――重點(diǎn)詞語辨析900例
10.in the end / at the end of / by the end of
in the end：最后，終于。指時(shí)間，相當(dāng)于at last或finally。例如：
例824：he waited and waited, but gave up in the end.
at the end of：在……末了，在……末端。指時(shí)間或地點(diǎn)。例如：
例825：at the end of the party, they added another program.
例826：you’ll find the post-office at the end of the street.
by the end of：在……結(jié)束時(shí)，到……末為止。常用完成時(shí)態(tài)。例如：
例827：we had learnt 24 units by the end of last term.
例828：we will have learnt 24 units by the end of this term.
11.in the past / in the past three years
in the past：過去（用過去時(shí)）。in the past three years：近三年（用現(xiàn)在完成時(shí)）。例如：
例829：our town was poor in the past, but great changes have taken place in the town in the past / last three years. （我們的鎮(zhèn)過去窮，可是近三年發(fā)生了翻天覆地的變化。）
1.because / since / as / for
because：因?yàn)椤１硎局苯佣鞔_的原因或理由，語氣最強(qiáng)。例如：
例830：it was because he got ill that he didn’t come.
since：既然。表示說話者和聽話者雙方都明白的原因，相當(dāng)于now that。例如：
例831：since you see my point, let’s start right away.
（既然你明白我的意思，那我們開始行動(dòng)把。）
as：因?yàn)椋热弧ＵZ氣不如because那么強(qiáng)。例如：
例832：as he is so mean, nobody around likes him. （他吝嗇，身邊沒有一個(gè)人喜歡他。）
for：因?yàn)椤ＵZ氣最弱，只是解釋性的，沒有直接的因果關(guān)系；它是并列連詞，不用于句首。例如：
例833：it must have rained，for the road is wet. （想必下過雨了，因?yàn)榈缆窛裰亍＃?br>2.if / whether
if和whether都有“是否”的意思。whether可以引導(dǎo)主語從句、賓語從句、表語從句和同位語從句，if則只能引導(dǎo)賓語從句且不放在句首；whether后可以接to do結(jié)構(gòu)，if 則不可以。另外，if有“如果”的意思，引導(dǎo)狀語從句。例如：
例834：whether they will come on time is still unknown.
例835：we don’t know whether / if they will come on time.
例836：we don’t know whether to come or not.
例837：if they come, we’ll tell you at once. （如果他們來了，我就馬上告訴你。）
3.though / although / even though / as though
though：雖然（用作連詞，引導(dǎo)狀語從句；也可用在倒裝結(jié)構(gòu)中）；然而（用作副詞，一般放在句末）。例如：
例838：though it was very late, he went on working.
例839：young though / as he is (=though he is young), he knows a lot.
例840：he said he would come, he didn’t, though.
although：雖然。不用作副詞，不用在倒裝結(jié)構(gòu)中。例如：
例841：although it was so cold, he went out without an overcoat.
例842：he is quite strong, although very old.
even though：即使。等于even if。例如：
例843：i wouldn’t attend his party, even though invited to.