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はまだ家にいる

is still at home

→ は
phrase Rare #30,219
is still at home は marks the topic, which usually appears before this phrase, such as a person's name.
JA: 妹はまだ家にいる。
EN: My younger sister is still at home.

トムはまだ家にいるって思ってたよ。

I thought Tom was still at home.

トムはまだ家にいる？

Is Tom still at home?

トムはまだ家にいると思う？

Do you think Tom is still at home?

いったいビルはまだ家にいるのでしょうか。

I wonder if Bill is still at home.

トムはまだ家にいるんでしょ？

Tom is still at home, right?

トムはまだ家にいると思うよ。

I think Tom is still at home.