1,学校门卫交给了我一封信__________________________2,他躺在草地上__________________________3,他刚刚洗完衣服__________________________4,他们乘火车旅行了吗?__________________________
问题描述：
1,学校门卫交给了我一封信
__________________________
2,他躺在草地上
__________________________
3,他刚刚洗完衣服
__________________________
4,他们乘火车旅行了吗?
__________________________
答
1. The school gatekeeper gave me a letter . 动作发生在过去,用过去时态.
2. He is lying on the grass . 正在发生,用现在进行.
3. He has just washed his clothes . 动作发生在过去,结果影响到现在,用现在完成时.
4.Have they travelled by train ? 同上