I don't know. I can't believe. I mustn't do it. I can stay. I haven't done my house work yet. It's not my car. The pen isn't yours. I can't wait. I didn't bought it. I haven't sliped on the ies yet. I didn't read. I mustn't go there. She mustn't come to school. She can't learn Spain. She isn't a beautiful. she doesn't have any time . I can't find my book. My teacher doesn't give us homework.