1) Make the sentences interrogative and negative:      a) I have to take a taxi.      b) We are able to meet at 5 o'clock.      c) You may doit yourself.2) Put the  sentences in the Past and Future Tense:      a) You must tell ...

1) Make the sentences interrogative and negative:       a) I don't have to take a taxi. Do I have to take a taxi?       b) We aren't able to meet at 5 o'clock. Are we able to meet at 5 o'clock?       c) You may not do it yourself. May you do it yourself? 2) Put the  sentences in the Past and Future Tense:       a) You had to tell us a story. You will have to tell us a story.       b) We couldn't go together. We won't be able to go together.       c) She might take the book. She will be allowed take the book. 3) Use modal verbs or their equivalents :       a) Could you do this work now       b) I won't be able to visit you next Sunday, because I have to meet my brother.       c) As the weather was fine, we would have to go to the country.       d) They can use a dictionary during their examp.