however和since区别

since 之前加ever，除了强调没有其他意思。常见的表达有：ever since, ever before, ever after, ever afterwards 等。

since 和ever since，都可以用作：副词（单独使用）；介词（接名词性词语）；连词（接从句）

一、ever since

英 [?ev? sins] 美 [v? s?ns]

adv.自从;从那时到现在;自…以后;从…起

扩展例句

1、Ever since World War the United States has been Japan's principal trade partner.

二次世界大战以来，美国一直是日本的主要贸易伙伴。

2、Ever since we moved last year, I worry a lot about whether I can handle this new job

自从去年我们搬家，我就一直非常担心能否做好这份新工作。

3、He came here for a holiday several years ago and he's lived here eversince.

几年以前他来这里度假，从那以后他便一直居住在这个地方。

4、He inherited his father's fortune and has lived like a pig in clover eversince.

他继承了他父亲的财产，生活极为奢侈。

二、since

英 [s?ns] 美 [s?ns]

prep.自从;从…以来;自从…之后

adv.以后，此后;后来;（距今几年）以前;（从那时候起几年）以前

conj.因为;既然;自从…以来;自从…的时候起

扩展例句

1、Even though her parents have long since died, she still talks aboutthem in the present tense.

尽管双亲早已离世，她谈论起他们时好像他们至今健在。

2、I'm forever on a diet, since I put on weight easily

我永远都在减肥，因为我很容易长胖。