It rains today.
Meaning: This means that water is falling from the sky in drops on the current day. It's like saying, On this particular day, water is falling from the sky in the form of raindrops.
Choice of Words: It refers to the weather. Rains is the present tense of the verb 'to rain,' which means water falls from the sky in drops. Today means the current day. When you combine them, "It rains today" means that water is falling from the sky in drops on the current day.
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Related Expressions