1.表示原因
1)There?are?three?reasons?for?this.?
2)The?reasons?for?this?are?as?follows.???
3)The?reason?for?this?is?obvious.?
4)The?reason?for?this?is?not?far?to?seek.???
5)The?reason?for?this?is?that...?
6)We?have?good?reason?to?believe?that...???
例如：?
There?are?three?reasons?for?the?changes?that?have?takenplace?in?our?life.?Firstly，people’s?living?standard?has?been?greatly?improved.?Secondly，most?people?are?well?paid，?and?they?can?afford?what?they?need?or?like.?Last?butnot?least，more?and?more?people?prefer?to?enjoy?modern?life.??
注：如写第一个句子没有把握，可将其改写成两个句子。如：Great?changes?have?taken?place?in?our?life.?There?are?three?reasons?for?this.这样写可以避免套用中的表达失误。???
2.表示好处
1)It?has?the?following?advantages.???
2)It?does?us?a?lot?of?good.???
3)It?benefits?us?quite?a?lot.???
4)It?is?beneficial?to?us.?
5)It?is?of?great?benefit?to?us.?
例如：?
Books?are?like?friends.?They?can?help?us?know?the?world?better，and?they?can?open?our?minds?and?widen?our?horizons.Therefore，reading?extensively?is?of?great?benefit?to?us.?
3.表示坏处
1)It?has?more?disadvantages?than?advantages.?
2)It?does?us?much?harm.???
3)It?is?harmful?to?us.???
例如：?
However，everything?divided?into?two.?Television?can?alsobe?harmful?to?us.?It?can?do?harm?to?our?health?and?make?us
lazy?if?we?spend?too?much?time?watching?television.?
4.表示重要、必要、困难、方便、可能
1)It?is?important(necessary，difficult，convenient，?possible)for?sb.?to?do?sth.?
2)We?think?it?necessary?to?do?sth.?
3)It?plays?an?important?role?in?our?life.?
例如：?
Computers?are?now?being?used?everywhere，whether?in?thegovernment，in?schools?or?in?business.?
Soon，?computers?will?be?found?in?every?home，too.?Wehave?good?reason?to?say?that?computers?are?playing?an?increasingly?important?role?in?our?life?and?we?have?stepped?intothe?Computer?Age.?一、表示递进关系的关键词语
Additionally 加之;又
besides 此外;除……之外
equally important 同样重要的是
furthermore 此外;而且
in addition 另外
in other words 换句话说
last but not least 最后但同样重要的是
moreover 而且;此外
that is say 即;就是;换句话说
二、表示转折关系的关键词语
although 虽然;尽管
at the same time 同时;但是
despite 不管;尽管;不论
even if 即使
even though 即使
however 然而;可是
in spite of 不管
instead 代替;而不是
nevertheless 然而;不过
on the contrary 正相反
otherwise 另外;不同地
regardless of 不管;不顾
still 依然;仍然
though 虽然;可是
while 而
yet 然而;但是;仍
三、表示选择关系的关键词语
either…or… ……或……
instead of… ……，而不是……
neither…nor… ……和……都不……
not…but… 不是……而是……
rather than… 宁可;胜过
whether…or not 是否
四、表示比较关系的关键词语
compare with / to 与……比较
equally 相等地;平等地
in comparison with 与……比较
in contrast 相反;大不相同
in contrast to 和……对比
in the same way 同样地
instead 代替;改为
on the contrary 正相反
while 而
五、表示因果关系的关键词语
accordingly 因此;从而
as a result of 作为结果
because (of) 因为
consequently 从而;因此
due to 由于;应归于
hence 因此;从此
in that 由于;因为;既然
now that 因为;既然
on account of 由于
owing to 由于;因……的缘故
so 所以
so that 所以
thanks to 由于
therefore 因此;所以
thus 因此
六、用于表示总结的关键词语
above all 最重要的是
accordingly 于是
as a consequence 因此
as a result 结果
as has been noted 如前所述
as I have said 如我所述
at last 最后
briefly 简单扼要地
by doing so 如此
certainly 当然地;无疑地
consequently 因此
eventually 最后
hence 因此
in a word 总之
in brief 简言之
in conclusion 总;最后
，我们将会及时处理。
