回答

[4] 3. <What(関係代名詞:もの/ことS1) is(V1) important(C1) (to you)(M)>(S2) is(V2) (also)(M) important(C2) (to me)(M).
<あなたにとって大切なこと>は私にとっても大切です。

[5]
1. My brother, who is only eight years old, goes to a cram school.
2. My father gave me his guitar, which I play every day.
3. They made a lot of noise, which irritated me.
4. What I want to know is your opinion.

参考にしてください。

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