注：ⅰ)連接性副詞位于句末時，前面一般用逗號，后面用句號。例如：
The new seats in the auditorium are more comfortable; the acoustics are worse , however.
ⅱ) 連接性副詞也放在句首，后面用逗號。例如：
I hadn’t read the test very carefully. Therefore , I was surprised that I had done so well.
I hadn’t read the test very carefully ; therefore , I was surprised that I had done so well.
ⅲ) then 和thus后面不用逗號。例如：
The ice cracked and split ; then that boy sank into the bone-chilling water.
EXERCISE 2
Punctuate the following sentences:
1.The plan won’t work for there are too many things wrong with it.
2.The bus broke down as a result we were late for work.
3.Martin left a note it said he would be late.
4.This is a new watch yet it doesn’t work.
5.Jim was very tired so he went right off to sleep.
6.Business was booming consequently the company needed more workers.
7.The sky was bright blue with a few white clouds in it and it was a beautiful day for the picnic.
8.The dining hall is nice looking the food however is terrible.
9.Attendance is compulsory the students have no choice therefore.
10.Some people put cream and sugar in their coffee others prefer it black.
11.Space exploration is costly nevertheless we must continue to spend money on space travel if we are to learn about our universe.
12.Astronauts are affected by weightlessness moreover they are also affected by boredom and loneliness.
EXERCISE 3
Correct punctuation mistakes in each sentence by adding a semicolon or a full stop, or a comma plus a suitable coordinating conjunction:
1.Unmanned space probes (探測器) eliminate the risk of death, furthermore, they cost much less than manned space flight.
2.Praise is like sunlight, we cannot flower or grow without it.
3.It was May, snow still lay under the branches of the thick pines.
4.The price of serious illness has risen drastically(大幅度地)in recent years, for example some hospital rooms now cost a hundred pounds a day.
5.John is short and quiet, his roommate is tall and talkative.
6.The window kept banging all night, I couldn’t sleep a wink.
7.Reckless (魯莽的) drivers would be severely punished, in fact they should lose their drivers’ permits for at least six months.
8.Jim liked to sample different kinds of food, I fixed some Chinese food for him.
9.Methods of studying vary, what works well for some students doesn’t work at all for others.
10.Philip was watching TV, Marie was upstairs on the phone.
(三)直接引語句的標點用法
1) 引述動詞位于句首
引述動詞+逗號/冒號+引語。例如：
Jim said: “I swim for an hour every day. ”
Tom said to his brother, “Put your toys away. Mom will be back soon.’’
2) 引述動詞位于句中
引語+逗號/驚嘆號/問號+引述動詞+逗號/句號+引語
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