Question

4．约翰过去周末常和他的朋友在网上聊天．（use；chat；Intenet）John used to chat with his friends on the Internet at weekends．．

Answer 1

分析 John used to chat with his friends on the Internet at weekends．

解答 答案：John used to chat with his friends on the Internet at weekends．表达的是过去常常结合use用used to do sth，主语John，与某人聊天结合chat用chat with sb，在网上on the Internet，at weekends．周末，故答案John used to chat with his friends on the Internet at weekends．

点评 used to表示过去常常做某事．
例句：I used to play football after school．过去我常常在放学后踢球．
be used to do的意思是被用来做某事；be used to doing的意思是习惯于做某事．
be used to 被用来做
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．
Scarf is used to taking a walk．（现在习惯于散步）