Dō sureba ii desu ka – Asking for advice, giving suggestions (～たらいいですか, ～ばいいです).
Unten shite wa ikemasen – Prohibitions, giving warnings, explaining rules. Minna No Nihongo Lesson 1 To 25 Kaiwa
Chotto tetsudatte kuremasen ka – Making requests using te-form + ください, offering help. Dō sureba ii desu ka – Asking for