Let's consider the following conditional sentence but without "ONLY".

ボタンを押せば、ジュースが出る。If you press the button, the juice comes out.

When "ONLY" is inserted with さえ, the conditional sentence becomes as follows.

A: ボタンを押しさえすれば、ジュースが出る。


Why do we not use B instead of A?

B: ボタンさえ押せば、ジュースが出る。


You can use both expressions fine.

Eg, Say you were explaining to a foreigner in Japan on using a vending machine who had never used one before. You could say something like this,

All you have to do is ,press the button and a drink will come out.


All you have to do is study and you will pass.


I see where "only" is implied and using "all you have to do" as the meaning "you only have to do...."

Hope that helps.


Both A and B are correct. B's also not wrong at all.

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