YOU SAID:

you should be practicing

INTO JAPANESE

あなたは練習するべきです

BACK INTO ENGLISH

You should practice

INTO JAPANESE

練習するべき

BACK INTO ENGLISH

Should be practiced

INTO JAPANESE

練習する必要があります

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I need to practice

INTO JAPANESE

僕は練習しなきゃいけない

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I need to practice.

INTO JAPANESE

僕は練習しなきゃいけない

BACK INTO ENGLISH

I need to practice.