Then comes summer and autumn.语法正确吗？

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凌哥，您好！我想请教一个问题。冀教版小学英语六年级上册第三单元第18课The Snowman 第49页中有：Spring is coming. Then comes summer and autumn.

请问第二句话中，主语是and连接的并列词组，come 为什么加s?

您好！

这句话和倒装句的语法点有关。

Then come/comes ...的倒装与There is/are ...的倒装规则是一样的道理。

在https://english.stackexchange.com/questions/530123/singular-or-plural-has-have-vs-was-were中，提到了要重点关注there的词性：

To understand the solution to your problem, it is necessary to examine the word "there"

"There" is only ever an adverb. There is a common misconception that "there" can be a pronoun.

即there是副词，不是代词。

继而举了3个副词开头的倒装句：

Only after the war was over did he go home

Dearly do I love you.

Many are the times that I thought of you. (Many are the times -> The times exist numerously.)

与时间有关的用法倒装举例：

There comes a time when this partial makeover wasn’t good enough. (BBC documentary)

另外还有一本书名：And Then Comes Summer以及一本DVD影片First comes Saturday, then comes Sunday. 同样，需要指出的是：then和first也是副词。

凌哥并没有在网络上找到Then comes summer and autumn.的原句。但是，依据倒装句和就近原则的原理，Then comes summer and autumn.是正确的表达方式，和There lies a building and a tower by the lake.一样，尽管主语是并列词组，但是动词还是用第三人称单数形式。