Learn Hardcore Japanese: sono siryou ha senmonka ni mo misemasu. - I will also show those materials to an expert.

その is a demonstrative adjective meaning that. It refers to something already known to the listener or mentioned earlier, so その資料 is “that document.”

Why is 資料 marked with は instead of を?

は marks the topic of the sentence, which here is その資料. When you topicalize the direct object, you replace を with は, giving a nuance like “as for that document...” and emphasizing it as the topic.

Could I say その資料を専門家にも見せます instead? What’s the difference?

Yes. Using を (その資料を専門家にも見せます) simply marks 資料 as the object without topicalizing it. It shifts the focus onto the action of showing. Using は emphasizes the document as the topic: “As for that document, I will also show it to experts.”

Why is に used after 専門家?

に marks the indirect object or the recipient of the action. In 専門家に見せます, it tells us you are showing something to the experts.

What does も add when attached as にも to 専門家?

も means “also” or “too.” When combined with に as にも, it means “to… as well.” 専門家にも見せます indicates “I will show it to experts as well,” implying others are being shown it too.

What is the implied subject of 見せます here?

Japanese often omits subjects when clear from context. Typically it’s “I” or “we” based on who is speaking. You could include 私は or 私たちは at the beginning (私はその資料を専門家にも見せます) if you need to be explicit.

What is 見せます and how is it different from 見る?

見せます is the polite non-past form of the causative verb 見せる, meaning “to show” (to make someone see). 見る means “to see” or “to look at,” so 見せる is you causing someone else to see something.

What happens if I say 専門家もその資料を見せます instead of 専門家にも?

Putting も on 専門家 as 専門家も means “experts too” are performing the action of showing (they’re showing the document), not that you’re showing the document to experts as well. The focus shifts from recipients to agents.