how long has Jim been at this school?回答为什么要用since 3 years ago不用3 years ago?how long不是提问一段时间吗?

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• how long has Jim been at this school?回答为什么要用since 3 years ago不用3 years ago?how long不是提问一段时间吗?
• Jack has studied Chinese for 2 years.对for 2 years划线提问!How long has Jack studied Chinese?为什么不是How long have Jack studys Chinese?(不是讲当在一般现在时中主语是第3人称单数时,变一般疑问句是要把has变为have吗?Jack不是第3人称吗,后面怎么不用studys呢?)
• B） 用have/has been to/in,have gone to的各种形式填空.1) Where is Jack?He __________ his country.2) John _______ England since he came back.3) How long _____ have _____ this village?4) The Smiths ______ Beijing for years.5) _____ you ever ____ America?-- Yes,I _____ there many times.6) I _____ this school since three years ago.
• 用have/has been to/in,have gone to及go的各种形式填空.高手精英进.1) Where is Jack?He __________ his country.2) David ________ the park just now.3) John _______ England since he came back.4) How long _____ have _____ this village?5) The Smiths ______ Beijing for years.6) _____ you ever ____ America?-- Yes,I _____ there many times.7) I _____ this school since three years ago.8) Where is Jim?He _____ the farm.9) When_____ he _____?He _______ an hour ago.10) Would you l
• 用have/has been to/in,have gone to及go的各种形式填空.1) Where is Jack?He __________ his country.2) David ________ the park just now.3) John _______ England since he came back.4) How long _____ have _____ this village?5) The Smiths ______ Beijing for years.6) _____ you ever ____ America?-- Yes,I _____ there many times.7) I _____ this school since three years ago.8) Where is Jim?He _____ the farm.9) When_____ he _____?He _______ an hour ago.10) Would you like to
• -2,-8,0,64下个数字是什么?
• how long have you been —— this school?为什么不用On 用in?