Question

4．约翰过去常和他的朋友在网上聊天．（ used to ）
John used to chat with his friend on the Internet．

Answer 1

分析 John used to chat with his friend on the Internet．

解答 答案：John used to chat with his friend on the Internet．结合句意是表达过去常常结合所给的used to用used to do sth，主语John，chat with sb与某人聊天，on the Internet在网上，故答案是John used to chat with his friend on the Internet．

点评 used to+do："过去常常"表示过去习惯性的动作或状态，但如今已不存在．
Mother used not to be so forgetful．
Scarf used to take a walk．（过去常常散步）
be used to+doing：对…已感到习惯，或"习惯于"，to是介词，后需加名词或动名词．
He is used to a vegetarian diet．