“they are wasting resources, for example, time, energy and money.”
上面这句话不错，只是转折词“for example”不妥当；应该这样：
“they are wasting resources. for example, they use too much time, energy and money.”
不然就要换一换转折词，改用“such as”或“like”：
“they are wasting resources, such as (or like) time, energy and money.”
不管任何语言，转折词（transitional words）都扮演着一个重要角色，就是：承先启后，使句子紧凑，段落相吸，对文章结构，有良性作用。但是有些人几乎没有采用转折词的习惯，结果文句松散，上下文七零八乱，应该避免。
现在把主要转折词，分类列下，供大家参考。
ⅰ表示“尤有进者”的意思：
again, also, then, besides, further, furthermore, moreover, next, in addition等，如：
① jason teaches diligently. besides, he writes a lot.
② english is a useful language. for one thing, it is an official language in the un. then, it is widely used in business, science and technology.
ⅱ表示“反意见”：
but, however, still, yet, after all, for all that, in spite of, on the contrary, on the other hand等，如：
③ jim is intelligent but lazy.
④ singapore is not a big the contrary, it is very small.
ⅲ表示“困果关系”：
therefore, so, hence, thus, accordingly, consequently, as a result 等，如：
⑤ some people are over-ambitious. as a result, they are usually unhappy.
⑥ tom did not work hard; hence, he failed.
ⅳ表示“比较关系”：
likewise, similarly, in a like manner 等，如：
⑦ you cannot writes without a pen. likewise, you cannot cook without rice.
⑧ no one is allowed to speak mandarin in an english class. similarly, no one is allowed to speak english in a mandarin class.
ⅴ表示“举例示范”：
for example, in other words, for instance, that is 等，如：
⑨ there are some common errors in his composition. for instance, it is wrong to use "he" to replace "the queen".
ⅵ表示“结束”：
to sum up, in brief, in short, on the whole, to conclude 等，如：
⑩ some say singapore is a nice place to live in. others say it is not so nice. it is too competitive.
in short, some like singapore; some do not.
常用的名言和谚语。
virtue and a trade are the best portion for children.
德行和一门技能是孩子最好的遗产。
better early than late.
宁早勿迟。a man can do no more than he can.
量力而行。honesty and diligence should be your eternal mates.
诚实和勤奋应成为你永远的伴侣。
early birds catch worms.
早起的鸟儿有虫吃。
every coin has its two sides.
有利有弊。every man has his hobby-horse.
人各有所好。
every man has his his taste.
人各有所好。
every one is born equal.
人人生而平等。
every rose has its thorn.
每朵玫瑰都有刺。
good things stay indoors while bad things will go far away.
好事不出门，坏事传千里。
gossip is a fearing thing.
人言可畏。he who keeps company with the wolf will learn to howl.
近朱者赤，近墨者黑。
it is never too late to learn.
学习永远不嫌晚。
where there is a will, there is a way.
有志者事竟成。
health is better than wealth.
健康胜于财富。
a contented mind is a perpetual feast.
知足长乐。a friend in need is a friend indeed.
患难见真情。
every advantage has its disadvantages.
有利必有弊。
every little makes a nickel.
积少成多。self-trust is the first secret of success.
自信是成功的第一秘诀。
example is better than precept.
言传不如身教。
no pains , no gains.
不劳无获。throw the baby out with the bath water.
把洗澡水连同婴儿一起倒掉。
one man's meat is another man 's poison.
百人有百好。
if the old dog barks, he gives counsel.
不听老人言，吃亏在眼前。
parents are the first teachers of the children.
父母是孩子的第一任老师。
different strokes for different folks.
各有所好。an old man is treasure of a family.
家有老人便是宝。
you live with a lame, you will learn a limp.
近朱者赤，近墨者黑。
he that lives with cripples learns to limp.
近朱者赤，近墨者黑。
it is good to learn at another man's cost.
前车之鉴。the devil knows many things because he is old.
人老监视广。
all bread is not baked in one oven.
人与人不同，花有几样红/不能强求一致。
任何事情都有利有弊。
forgetting history means betrayal.
忘记历史意味着背叛。
strictness helps, indulgence spoils.
严是爱；松是害。
father is one hundred headmasters.
一个父亲胜过百个老师。
all work without play makes jack a dull boy.
只干活不玩耍，聪明的孩子会变傻。
never put off until tomorrow what can be done today.
今天的事情今天干。
if you want to understand today, you h**e to research yesterday.
要想懂的得今天，就必须研究昨天。
each man has his limitation.
人各有极限。
they that live longest see most.
人越老，越有智慧。
think thrice before we leap.
三思而后行。
too much liberty spoils all.
自由过了头，一切乱了套。
a wise man and a fool together know more than a wise man.
三个臭皮匠赛过诸葛亮。
the older, the wiser.
年岁增长，智慧增长。
the onlooker sees the game best.
旁观者清。the spectator sees most clearly.
旁观者清。two heads are better than one.
三个臭皮匠赛过诸葛亮。
years bring wisdom.
年岁增长智慧。
a friend is easier lost than found.
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