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Tom is used _____(run) for 30 minutes on the playground ever

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Tom is used _____(run) for 30 minutes on the playground everynight.
to running
Q1.为什么是 to running?
Q2.关于 use的用法及变形
Q3.use、used、useful、user、useless等的只要是其中有use的词语或词组的属性、用法等
Q4.是use to do啊还是use doing,什么的
看来你是全混淆了.没事,别乱!
其实告诉你两个词组的用法你就全明白了：
1、used to do(“过去常常做某事”---过去时态)
2、be used to doing(“习惯于做某事”---一般现在时态)
Q3.use（使用v.）、used（“习惯”的过去式,即“过去习惯”）、useful（有用的）、user（用户）、useless（无用的）
Tom is used _____(run) for 30 minutes on the playground ever Tom is used ＿＿＿ for 30 minutes on then playground every nigh It is d___ for me to run in the playground. 1.Look!Tom and Bob __(run) on the playground.2.___ they___ ( Li Tao( )(run）fast.Look!He is （ ）（run) on the playground. look!they______(run) on the playground look!david____(run) on the playground. He____(not run)on the playground now. Some girls____(run)on the playground Look!He ___(run) on the playground. do you often see william _____(run)on the playground?no but Tom often ___ around the playground. A.run B.