order of 2 or more nouns


I am a beginner. Here is the sentence in Tae-Kim guideline:

ボブ：うん。でも、明日雨が降るよ。

1/ Notice that the order is 明日雨. Is this order correct 雨明日 ?

2/ If not, suppose there are 3 or more nouns that can stand next to each
other, is the order of nouns really important ?

Thank you.




In Japanese, grammatical clauses are generally marked as such by adding a
specific particle at their ends.

For grammatical subjects, that particle is が. In your example sentence, the
subject noun is 雨. Therefore the subject of your sentence is 雨が.

Note that this is a tightly coupled single lexical unit. In other words, you
cannot just insert stuff (like 明日) in-between the clause head and its
particle: "雨明日が" is nonsensical (a blatant syntax error) from the point of
view of parsing the Japanese language.

That said, as long as you don't separate particles from their clauses,
Japanese is quite flexible in allowing you to swap things around: "雨が明日降るよ" is
a valid (if slightly odd) alternative. (With this word/clause order, the
emphasis is more on 明日 than 雨, due to its proximity to the verb 降る.)

