Ответ: 2.a) What are you doing on Saturday?b)What are you doing at the weekend?3.a)They often go out in the evenings.b)They often go out on Sunday evenings.4.a)Do you work on Wednesday?b)Do you work every Wednesday?(no preposition)5.a)We usually have a holiday in the summer.b)We often have a short holiday at Christmas.6.a)Pauline got married in 1991.b)Pauline got married on 18 May 1991 c)Chris is getting married this year.