我觉得这两个问题的关键点在于引述上(直接引述,简介引述)i met a friend onmy way to buy oil for my mom and i told him hat my mom let me to buy oil for her 从句里面动词可以用一般现在时的,所以这个let是现在时的。i met a friend on my way to buy oil and i told him :"my mom let me to buy oil for her."这里的let是过去时的,因为你在诉说你妈妈已经说了的话。i met a friend on my way to buy oil and i told h