这里为什么不是用and then表示一种并列关系
I booked her a flight back to Seattle，then to San Francisco.
这里then是副词，来表示时间“然后，接着”，我的疑问是这样的句型是省略了什么，还是这样表达就是没问题的？
最佳答案 2022-08-07 10:53
你读一下the freedictionary 对then用作连词的用法说明：
Usage Note: Sticklers for grammar sometimes assert that then is not a coordinating conjunction, and that the sentence She took a slice of pie, then left is thus incorrect; it must be rewritten as She took a slice of pie and then left, in which the then acts as an adverb and the halves of the compound predicate are linked by the coordinating conjunction and. But this use of then as a coordinating conjunction is actually both widespread and widely accepted; in our 2012 survey, more than three quarters of the Usage Panel found the sentence She took a slice of pie, then left completely acceptable. Note, though, that the punctuation of this conjunctive use of then differs from the usual punctuation for similar sentences using and. No comma is needed when and links the parts of a compound predicate, as in She took a slice of pie and left. When then joins the halves of the predicate, a comma is usually required; only 8 percent of the Panel approved of She took a slice of pie then left.
再看牛津词典的例句：
First cook the onions, then add the mushrooms.
We lived in France and then Italy before coming back to England.
I took a week's vacation, then went back to Ohio.
由此可知，逗号+then 相当于and then。但如果用了and then，则不能再用逗号。
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