Breakdown of kyou no tenki ha ii desu ga, yoru ni yuki ga huru kamo siremasen.
はha
topic particle
ですdesu
to be
今日kyou
today
がga
subject particle
いいii
good
のno
possessive case particle
にni
time particle
夜yoru
night
がga
but
雪yuki
snow
天気tenki
weather
降るhuru
to fall
かも しれないkamo sirenai
might
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Questions & Answers about kyou no tenki ha ii desu ga, yoru ni yuki ga huru kamo siremasen.
Why is の used in 今日の天気?
の is the attributive/genitive particle that links two nouns. In 今日の天気, it literally means “weather of today,” i.e. 今日の天気 = “today’s weather.”
Why is 天気 marked with は? How is は different from the subject marker が?
は marks the topic of the sentence (“as for the weather…”), indicating what you are commenting on and often implying contrast or the scope of your statement. In contrast, が marks the grammatical subject that performs or experiences an action (e.g. in 雪が降る, 雪 is the subject “snow”).
What is the function of the が in いいですが?
This が is the conjunctive particle meaning “but” or “however.” It connects the first clause (“The weather is nice”) to the second clause (“it might snow at night”).
Why does the sentence use 夜に instead of just 夜? Can you drop に with time expressions?
に marks a specific point in time (“at night”). Some time words (like 毎日, 来週) can omit に, but more specific times or 夜 often take に for clarity. You could say 夜雪が降るかもしれません, but 夜に makes the timing explicit.
What grammar pattern is ～かもしれません, and why is 降る in the plain form?
The pattern (plain dictionary form) + かもしれません expresses possibility (“might do X”). Because it attaches to the plain form of the verb, you use 降る rather than the polite 降ります.
What’s the difference between かもしれません and かもしれない?
かもしれません is the polite form, ending with ません, while かもしれない is the plain/informal form. Both mean “might” or “perhaps.”
Can ～かもしれません be shortened in casual speech?
Yes. In casual conversation you often hear かも (e.g. 雪が降るかも), which is a very colloquial short form of かもしれない.
Why is いい used instead of 良い, and how does いいです fit politeness?
In modern Japanese, いい is the usual spelling/pronunciation for the adjective “good” (historically written 良い). Adding です makes it polite, so いいです is simply the polite way to say “is good.”
The first clause has no explicit subject. How do we know what it’s talking about?
Japanese often omits subjects when context is clear. Here, 天気はいいです literally means “As for the weather, it is good,” so the topic 天気 itself tells you what the (unstated) subject is.