一般将来时和将来完成时有何区别有什么用法上的区别,最好能补充例句,

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• 一般将来时和将来完成时有何区别有什么用法上的区别,最好能补充例句,
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• 怎样区别将来完成时与将来完成进行时-——Is Tom still smoking?—— No.By next Saturday he___for a whole month without smoking a single cigarette.A.will be B.will have gone C.will have been D.has been going为什么要用将来完成时呢.能不能用will have been going 呢By next summer he___in this factory for thirteen years.A.has been workingB.will have been workingC.will be workingD.has worked为什么要用将来完成进行时呢.用将来完成时行吗