Correct a mistake in each of following sentences. 1)I have work hard to inprove my English. 2)Joan don’t have to go.She

 1)I have to work hard to inprove my English. 2)Joan doesn’t have to go. She can stay here. 3)I’m sorry I’m late.I had to do the shopping. 4)I think the spacemen have to know English. 5)Does she have to read this rule? 6)Tom doesn\'t have to use a computer. 7)You have to know English to understand people. 8)Does Mary have to help Ann to study English? 9)What time do you have to get up? 10)Does your teacher have to correct your homework?