用since和for各造十个句子.（完成时）
问题描述：
用since和for各造十个句子.（完成时）
一定要现在完成时!since和for各十句,共二十句!认真点,
答
since1.They left town and haven't been here since.他们离开了镇子,从那以后再也没有来过这儿2.They have been friends since childhood.他们从幼时起一直是好朋友3.She's been skiing since childhood.她从幼时起...