1．如两个句子在逻辑上是并列关系,可前一句后使用逗号,再加有关的并列连接词(包括and，but，for，yet，or，nor，so等)连接后一句。例如:
(1)Mary went to the supermarket，for she needed to buy some bread for dinner.
（2）It was boiling hot at the beach and we forgot to bring our swimming costumes.
2.如两个句子在意义上联系密切,也可用分号隔开,而不接连词。例如:
(1)Mary went to the supermarket；she needed to buy some bread for dinner.
（2）It was boiling hot at the beach；we forgot to bring our swimming costumes.(www.xing528.com)
3.把两句看成是分别独立的句子,两句都使用句号。但此种形式仅在表示强调时使用。例如:
(1)He graduated from the university in 1995.He took a job with an insurance company.
（2）We must try our best to improve our writing.It will be useful for our future work.
4.把两个独立句中的一句改成从句,使用after，although，before，unless，as，because，even，though，if，since，until，when，while等从属连词,让句子成为主从复合句。例如:
(1)Mary went to the supermarket because she needed to buy some bread for dinner.
（2）After he graduated from the university in 1995，he took a job with an insurance company.
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