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改错:1、Last sunday I was helping my father in his teahouse whe

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改错:1、Last sunday I was helping my father in his teahouse when a foreign visitor entered in.
2、You can never imagine how excited i was when heard the word.第一句要去in,第二句when后要加I这是为什么啊?请详解,\(≧▽≦)/~
改错:1、Last sunday I was helping my father in his teahouse whe
1. 去掉in (enter就含有in的含义了)
2. 这是因为when引导的时间状语从句的从句后面缺乏主语的缘故.