A recent comment under a question of mine prompted me to consider how 接続助詞
work syntactically, and to discover that different ones follow different 形
([Japanese
Wikipedia](https://ja.wikipedia.org/wiki/%E5%8A%A9%E8%A9%9E#%E6%8E%A5%E7%B6%9A%E5%8A%A9%E8%A9%9E)
has a nice list). However, no such classification seems to exist for 接続詞,
which leads to the question: How do 接続詞 work syntactically?

Most commonly, they seem to exist at the start of clauses, such as

> 後半戦で必死の追い上げを見せた。しかし、あと一歩及ばなかった。

however, some also seem to be joining NPs

> 山間部では雨、または、雪が降るでしょう。

> 身分証明書および印鑑をご持参ください。

Since Japanese Wikipedia classifies these particular 接続詞 as 並立, it would be
tempting to draw the analogy that these, similar to 並立助詞, connect NPs while
others begin/connect clauses, but this is probably a simplification.

Thus: What are the types of 接続詞, and how can they be used syntactically?
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2022-01-03T03:28:33.047
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2022-01-03T03:28:33.047
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question
grammar syntax phrases conjunctions parts-of-speech
Are 接続詞 a syntactically unified class or classes of words, and what are the rules governing them?