问题标题：
hehasbeenasoldierforthreeyears.改为同义句：Itisthreeyears----------------------------thearmy.
问题描述：
hehasbeenasoldierforthreeyears.改为同义句：Itisthreeyears----------------------------
thearmy.
郭奇回答：
Itis/hasbeenthreeyearssincehebecameasoldier.
固定句型：Itis/hasbeen+一段时间+since.不管是用is还是hasbeen,since从句都用过去时
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