Выполнить перевод предложений на употребление сложноподчиненных предложений и глаголов в Past Perfect, Past Continuous, Future in the Past.
2.1 I know the man who invented this tool.
2.2 It is the tradition which everybody must follow.
2.3 He says that he joins us.
2.4 We shall celebrate our holiday before the weather changes.
2.5 The next custom in this year which is connected to the history is very interesting.