81. at, in (表地址)
at小地址，in大地址 arrive at a small village, arrive in Shanghai
82. increase to, increase by
increase to增长到…，increase by增长了… The number increased by 2,000 to 5,000.
83. since, for (完结时刻状语)
since接点时刻或一句话，for接一段时刻 for three years, since 3:00
84. on earth, on the earth, in the earth
on earth在世上，在人世，终究，终究，一点也不，on the earth在地上，在地球上，in the earth在地下，在泥土里 no use on earth
85. in surprise, to one's surprise
in surprise惊讶地，to one's surprise使或人吃惊的是，
86. in the air, on the air, in the sky
in the air正在酝酿中，on the air播送，播送，in the sky在天空中 His show is on the air at 6:00 tonight.
87. through, across
through穿越空间，across在…上穿过 through the forest, across the desert
88. on the way, in the way
on the way在前往…的路上，in the way挡道 The chair is in the way.
89. above, on, over
above在上面，不触摸，on在上面，触摸，over在正上方 fly over the hill
90. until, not…until
until到…停止， not…until直到…才（常跟点动词连用）I waited until 3:00. He didn't come until 3:00.
91. besides, except, except for
besides除了…还（包含在内）except除了（不包含在内），except for全体…除了某一点以外 The composition is good except for a few spelling mistakes.
92. whether, if
当是否解时，只要在宾语从句中二者能够交换，其他都用whether，当假如解时用if I don't know if/whether he will come. If he comes, I'll let you know.
93. because, since, as, for
原来由强到弱为：because, since/as, for. 在句中的方位如下：1)…because… 2) Since/as…, … 3) …, for… Since I was ill, I didn't go.
94. when, as, while (表时刻)
when从句动词点动词，持续性动词均可，as重在表明动作同时发作，随同进行，while从句动词为持续性动词 While I slept, a thief broke in.
95. the same…as, the same…that
the same…as和…相同的（类似但不同一）， the same…that 同一物体 This is the same pen that I used yesterday. (同一支笔)
96. as well, as well as
as well也，常放于句末，和and连用表明既…又；as well as并排连词，不光…并且… He is a professor, and a writer as well.
97. such…as, such…that
such…as像…样的，such…that如此…以至于 He is not such a fool as he looks like. He is such a good student that all the teachers like him.
99. because, because of
because连词，衔接两句话，because of介词短语，后接词或短语 He didn't go to school because of his illness.
100. in order that, in order to
表意图，in order that后接语句，in order to后接动词原形 I got up early in order to catch the first bus. I got up early so that I could catch the first bus.