Dative case in Russian language

1. Dative with Accusative case I gave a book to my friend - Я дал книгу (acc.) другу (dat.); It answers the questions to whom / to what. We speak about the recipient of the action. He gives this book to me - Он дает книгу мне (dat.). 2.Dative with Prepositional case I promised to tell them about the project - Я обещал рассказать им (dat.) о проекте (prep.); It answers the question what about 3.Dative with Infinitive form I promised them to tell about the project - Я обещал им (dat.) рассказать (inf.) о проекте. Other videos - https://achkasoff.com/russian.html