问题标题：
【帮个忙用since,for,havegone,havebeen填1.Wehavelearnedfivelessons__thebeginningofthisterm.2.MrsLiaohasbeeninhospital__lastweek.3.Ihavestayedatmyaunt's___twoweeks.4.Wherearetheboystudents?They___tothelibrary.5.Isyourfa】
问题描述：
帮个忙用since,for,havegone,havebeen填1.Wehavelearnedfivelessons__thebeginningofthisterm.
2.MrsLiaohasbeeninhospital__lastweek.3.Ihavestayedatmyaunt's___twoweeks.4.Wherearetheboystudents?They___tothelibrary.5.Isyourfatherin?No,he__toShenzhen.___heever___therebeforYes,he___thereseveraltimes.6.IwanttogotoShanghaiforavisitbecauseI___never____tothatcitybefore.
马锐回答：
1since
2since
3for
4havegone
5hasgone,Has,been,hasbeen
6have,been
分析
for+一段时间
since+过去的时间点
havegoneto人不在这里,去了某地了（后接副词时省略TO
havebeento曾经到过……（后接副词时省略TO）
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