[Student’s sentence]

 

田中さんはアメリカ育ちなので英語が話せるべきです。
Tanaka-san grew up in the USA, so he/she is expected to be able to speak English.

*たなかさんはアメリカそだちなのでえいごがはなせるべきです。

 

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[My correction]

 

田中さんはアメリカ育ちなので英語が話せるべきです。
→田中さんはアメリカ育ちなので英語が話せるはずです。
Tanaka-san grew up in the USA, so he/she is expected to be able to speak English.

 

〜はず indicates that, based on the circumstances, you are convinced it is natural to expect something. In contrast,〜べき suggests something is the right and natural duty. In this context, 〜はず is appropriate as it suggests Tanaka-san is expected to speak English due to being raised in the USA.

 

Examples:

合格(ごうかく)した人はすごく勉強(べんきょう)したはずです。
People who passed the exam must have studied very hard.

 

合格したいならもっと勉強するべきです。
If you want to pass, you should study more.

 

田中さんはもうタバコをやめたから吸(す)わないはずです。
Tanaka-san is expected not to smoke since he/she has already quit.

 

タバコは体(からだ)に悪(わる)いからやめるべきです。
You should quit smoking because it’s bad for your health.

 

In the JLPT course, each lesson includes homework. Submit your homework, and I’ll provide corrections. I’ll break down Japanese grammar, highlighting mistakes and explaining structures and nuances in a simple way. Feel free to ask as many questions as you need—I’m here to help you understand!