语法2 --标点的用法 句号（句号（period））:必须各自构成句子，其逻辑关系为因果关系必须各自构成句子，其逻辑关系为因果关系或后句对前句的说明关系或后句对前句的说明关系例句：例句：1.I could not get through Hannah yesteday evening .Her brother was talking on the phone all the time.(因因果关系果关系) 2.He ask me a question. I answer him.(从属关系从属关系)3.He is very hard. However he did not get a good mark in the last exam.(转折关系转折关系) 分号（分号（semicolonsemicolon））: :动词必须各自构成句子，其逻辑关系为后句动词必须各自构成句子，其逻辑关系为后句对前句的说明对前句的说明例句：例句：1.We could have walked to the 1.We could have walked to the station;itstation;it was so near.( was so near.(因果关系因果关系) ) 2.Venice is built on 117 2.Venice is built on 117 island;itisland;it has 150 canals and 400 bridges.(has 150 canals and 400 bridges.(从属从属关系关系) )3.People make 3.People make history;usualhistory;usual people people make history interesting.(make history interesting.(并列关系并列关系) ) 逗号（逗号（comma））:如果两个动词各自构成的句子要用逗号连接，其如果两个动词各自构成的句子要用逗号连接，其中一个句子要用连词，其逻辑结构以连词意义为中一个句子要用连词，其逻辑结构以连词意义为标准；否则其中一个动词要用非谓语动词。
标准；否则其中一个动词要用非谓语动词例句例句: :1.I thought we would be later for the1.I thought we would be later for the concert ,but we ended up getting concert ,but we ended up getting there ahead of time.(there ahead of time.(转折关系转折关系) )2.Standing over there ,and you will 2.Standing over there ,and you will be able to see the oil painting be able to see the oil painting there.(there.(并列关系并列关系) ) 3.It must have rain last night ,for 3.It must have rain last night ,for the ground is wet.(the ground is wet.(因果关系因果关系) )4.The professor ,along with his 4.The professor ,along with his assistant ,is working on the project assistant ,is working on the project day and night to meet the deadline.day and night to meet the deadline.( (伴随关系伴随关系) ) 。