watashi no tomodachi wa byouki nanoni zangyou o shite ite, kawaisou desu.

topic particle

Breakdown of watashi no tomodachi wa byouki nanoni zangyou o shite ite, kawaisou desu.

• です: to be
• 私わたし: I
• を: direct object particle

Questions & Answers about watashi no tomodachi wa byouki nanoni zangyou o shite ite, kawaisou desu.

Why does 私 have の after it?

の shows possession or connection. So 私の友達 means my friend.

Literally, it is something like:

• 私 = I / me
• 私の = my
• 私の友達 = my friend

This is one of the most basic uses of の in Japanese.

Why is there は after 友達?

は marks the topic of the sentence. Here, 私の友達は means as for my friend...

The sentence is about that friend, and the rest of the sentence says something about them:

• 私の友達は = as for my friend
• 病気なのに残業をしていて、かわいそうです = even though they are sick, they are working overtime, and I feel sorry for them

So は is not exactly the same as an English subject marker. It introduces what the sentence is talking about.

Why is it 病気なのに and not just 病気に or 病気のに?

Because のに attaches differently depending on what comes before it.

病気 is a noun in this sentence, so you need な before のに:

• noun + なのに
• な-adjective + なのに
• い-adjective + のに
• verb + のに

So:

• 病気なのに = even though someone is sick

You cannot say 病気のに here.