1. A. The children go to school by car every day, but today they are going on foot.
B. Mrs Brown usually stays at home in the morning, but this morning she is going to the shops.
C. Now I am combing my hair
2. A. We bought a new car on Tuesday. Did we buy a new car on Tuesday? We didn't buy a new car on Tuesday.
B. Mike did his homework yesterday. Did Mike do his homework yesterday? Mike didn't do his homework yesterday.
C. They stayed at home yesterday. Did they stay at home yesterday? They didn't stay at home yesterday.
3. A. The woman is speaking with her daughter now. Is woman speaking with her daughter now? The woman isn't speaking with her daughter now.
B. He is learning English grammar. Is he learning English grammar? He isn't learning English grammar.
C. Mary is helping her mother to cook. Is Mary helping her mother to cook? Mary isn't helping her mother to cook.