He often helps my mum to clean the house on Sunday.为什么用to clean不用clean?

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• My sister often helps my mum (clean)the house.
• He often helps my mum to clean the house on Sunday.为什么用to clean不用clean?
• My sister often helps my Mum______(clean)the house.
• He often helps my mum to clean the house on Sunday.为什么用to clean不用clean?
• My sister often helps my Mum______(clean)the house.
• My sister often helps my mum (clean)the house.
• it took him three hours to clean his bedroom的同义句
• 首字母填空!HELP!M_____of years ago,people looked at the f_____birds in the sky and they wanted to fly.They tried many different w_____to fly.First,they made wings f______pieces of paper.Then they put these wings on and jump off a hill into the a________.