逗号是ACT考试中被看到最多次的标点,它主要有4种用途。
1、用于连接一个句子中主语、谓语、表语、宾语、定语的并列成分。当并列成分,有三个或者三个以上,最后一个需要用逗号隔开。
如:Lily,Susie and I were enthusiastic about the movie.如:Having found the leaking pipe, the plumber cut off the water, replaced the pipe and told the homeowner to call him if the leak recurred.
2、 用于分隔同位语
如:Alice and her sisters, all scuba divers, spend a week diving at Marathon in the Florida Keys every year.
3、用于分隔至于句首或插在句中的状语或状语从句
如:Since you are in poor health, you should not stay up late.
如: After graduation, many graduates find it difficult to get a job.
4、用于分隔非限制性定语从句
如:My grandfather, who smokes a lot, is ninety.
5、 用于分隔插入语如:Some parents, it appears, are more concerned about their children’s test scores.
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