Sou desu (hearsay also known as mimi no sou desu)

Sou desu (Hearsay also known as mimi no sou desu)

The Japanese expression そうです (sou desu) that you will be learning in this lesson is used to convey the message that you obtained from another information source, either you have heard from someone or you have read it somewhere.
The sentence pattern for this grammar is quite simple...

～Plain-form そうです
～Plain-form sou desu

 I heard that ~.

Note: Plain-form means the word before "sou desu" can be verb, i-adjective, na-adjective or noun, all in plain-form.

In this Japanese expression, take note that your own opinion is not included in the information that you are conveying.
Let's use an example to show how this expression works using the following situation. In the office...

田中さんは言います。「京都はとてもきれいです。」
tanaka san wa iimasu. "kyouto wa                        Ms Tanaka says: "Kyoto is very beautiful."
totemo kirei desu."               

Suppose that you heard what Ms Tanaka has just said. Later on, Ms Tanaka left the office. A while later Mr Suzuki comes to your desk and you tell him the following...

田中さんは京都はとてもきれいだと言っていました。
tanaka san wa kyouto wa totemo kirei               Ms Tanaka said that Kyoto is very beautiful.
da to itte imashita

～と言っていました (~to itte imashita) is using the quotation, except that in this situation, the speaker who you are quoting from is absent and you are quoting what she has said in the past.

You can also convey the same message by using the Japanese expression そうです (sou desu)...

京都はとてもきれいだそうです。
kyouto wa totemo kirei da sou desu                    I heard that Kyoto is very beautiful.

However in this situation Mr Suzuki doesn't know where is the source of this information. If you want to give Mr Suzuki on the information source, you can say this...

田中さんによると京都はとてもきれいだそうです。
tanaka san ni yoru to kyouto wa                            According to Ms Tanaka, Kyoto is very beautiful.
totemo kirei da sou desu

So you can change the above sentence pattern into the following...

Information source によると ～Plain-form そうです
Information source ni yoru to ～Plain-form sou desu

According to Information source, I heard that ~.

The difference between ～と言っていました (~to itte imashita) and そうです (sou desu) is that the former is used to quote what another people had said. Whereas the latter is mostly used when the information source is unclear and you are just stating what you have heard or read.

You are also not sure whether what you have heard or read is true or not.

More examples

Source: 天気予報, Information: 明日は雨が降ります
天気予報によると明日は雨が降るそうです。
tenkiyohou ni yoru to ashita wa ame ga furu sou desu
According to weather forecast, it's going to rain tomorrow.

Source: 雑誌, Information: スペインの夏は暑いです
雑誌によるとスペインの夏は暑いそうです。
zasshi ni yoru to supein no natsu wa atsui sou desu
According to magazine, the summer of Spain is hot.

Source: 鈴木さん, Information: 山田さんは昨日元気ではありませんでした
鈴木さんによると山田さんは昨日元気ではなかったそうです。
suzuki san ni yoru to yamada-san wa kinou genki dewanakatta sou desu
According to Mr Suzuki, Mr Yamada was not feeling well yesterday.

Source: ニュース, Information: 2012年にロンドンでオリンピックがあります
ニュースによると2012年にロンドンでオリンピックがあるそうです。
nyu-su ni yoru to 2012 nen ni rondon de orinpikku ga aru sou desu
According to the news, Olympics will be held at London in 2012.

Source: 新聞, Information: 来年日本で大きい地震があるでしょう
新聞によると来年日本で大きい地震がある でしょう そうです。
shinbun ni yoru to rainen nihon de ookii jishin ga aru sou desu
According to the Newspaper, there might be a big earthquake in Japan next year.

Note: In this example, you need to remove the でしょう (deshou) in front of そうです (sou desu). You cannot put words like でしょう (deshou), らしい (rashii) or ようだ (youda) in front of sou desu.

Examples without the information source

Information: マイクさんは子供の時、アメリカに住んでいました
マイクさんは子供の時、アメリカに住んでいたそうです。
maiku san wa kodomo no toki, amerika ni sundeita sou desu
I heard that Mike lived in America when he was a child.

Information: チンさんは明日北海道へ行きます
チンさんは明日北海道へ行くそうです。
chin san wa ashita hokkaidou e iku sou desu
I heard that Mr Chin is going to Hokkaido tomorrow.

Sometimes, the Japanese expression そうです (sou desu) you have learned in this lesson is called 耳の"そう" (mimi no "sou") since the information is something you have heard or read from another source.