回答

[3] ※疑問詞+to ~
(1) Tell me (what) (to) (weat) to the concert.
(2) She showed Bill (how) (to) (use) chopsticks.
(3) We talked about (when) (to) (visit) Sarah in the hospital.
(4) I can't decide (which) (to) (choose)
[4]
(1) Could you tell me [where to get off] the bus? ※where to ~ どこで~すればいいのか  不要:how
(2) The students [seem to understand] their situation. ※seem to ~ ~するように見える・思える  不要:have
(3) His mother (seems to have been) a hairdresser. ※seem [to have ~ed](不定詞・完了形) ~したように見える・思える 不要:be
(4) Children [need to be loved] by people around them.  不要:are
※need to ~ ~する必要がある/need to [be ~ed](受動態) [~される]必要がある

参考にしてください。

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