〜そうだ (I hear)
I hear that, apparently
Plain form + そうです · Noun / な-adj + だそうです
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Plain form + そうです reports something you've heard: 明日は雨が降るそうです, "I hear it's going to rain tomorrow". The source often comes first with によると: 天気予報によると, "according to the forecast".
Nouns and な-adjectives keep だ: 医者だそうです, 有名だそうです.
This そう doesn't change for past or negative; that goes on the verb before it: 行かなかったそうです, "I hear he didn't go".
It's easy to confuse with the "looks like" そう. The difference is what comes before: a full plain form (降るそう, おいしいそう) is hearsay; a stem (降りそう, おいしそう) is appearance.
Examples
天気予報によると、明日は雨が降るそうです。
According to the forecast, it'll rain tomorrow.
田中さんは来月結婚するそうです。
I hear Mr Tanaka is getting married next month.
あの店のラーメンはとてもおいしいそうです。
Apparently the ramen at that place is really good.
山田さんの妹さんは医者だそうです。
I hear Ms Yamada's younger sister is a doctor.
昨日の試験は難しかったそうです。
I hear yesterday's exam was hard.