だけでいいall you have to do is, just, that's all

先生(せんせい)：「宿題(しゅくだい)は、本(ほん)を読(よ)むだけでいいです。」

Teacher: "All you have to do for homework is just read the book, that's all." {all you have to do is, just, that's all}

精神(せいしん)科(か)医(い)：「生(い)きているだけでいい。それで充分(じゅうぶん)。」

Psychiatrist: "Just being alive is enough. That's all." {all you have to do is, just, that's all}

上司(じょうし)が部下(ぶか)に：「黙(だま)っているだけでいい。出来(でき)るよな？」

The boss says to his subordinate: "All you have to do is stay quiet. You can do that, right?" {all you have to do is, just, that's all}

サプリを飲(の)むだけでいいダイエットなんて存在(そんざい)するわけがない。

There's no way that a diet exists where all you have to do is just take supplements. {all you have to do is, just, that's all}

先生(せんせい)に英語(えいご)の勉強(べんきょう)をするだけでいいと言(い)われたのにそれすら出来(でき)なかった。

The teacher told me that all I had to do was study English, but I couldn't even do that. {all you have to do is, just, that's all}