12t13tftead the text again and answer the questions.'l How long has Selena been famous?2 What charities does she work for?3 When did she become a UNICEF GoodwillAmbassador?Why did she visit Ghana for UNTCEF?Why are Goodwill Ambassadors important?flFllf l INTERFACE Work in pairs. Do GoodwillAmbassadors do an important job?Yes, because they publicizeproblems around the world.No, because they are rich and famous.They don't really help poor people.Grammar 2for and sinceHow long has she been a Goodwill Ambassador?She's been an Ambassador since August 2009.She's been an Ambassador for more than a year.Look at the sentences in the table and completetfie rules. Choose the correct words.a) We use for I since with a period of time.b) We use for I since with a point in time.Copy and complete the table with the timeexpressions in the box.2010 2pm April two frours tfrree week lthis morning a long time I was born ,Saturday a month last nightI5Compfete the sentences with for or since.l've lived in London sLwel was born.'l Jed's been at home ... two hours.2 | haven't played tennis ... I was ten.3 He hasn't done a sponsored walk ... he was 13.4 My sister has known her best friend ... a longtime.