1.他十三岁开始给地主干活，一直到解放。He began to work for a landlord when was thirteen years old until liberation.请问，为什么要加“when”???
热心网友
他十三岁开始给地主干活，一直到解放。He had been working for a landlord when he was thirteen years old until liberation.until 的句型中要用延续性动词，所以改成had been working ，when 后不能省略主语he,
热心网友
这里的"when"是引导一个时间状语从句，如果去掉的话会导致句子成分的残缺，
热心网友
began to work for a landlord 和 when was thirteen years old 共用一个主语"he",全句完整可看作:He began to work for a landlord when he was thirteen years old until liberation .
热心网友
搞错了吧,本来全句应是:He began to work for a landlord when HE was thirteen years old until liberation.省略哪有只省略he的?或者简单些He began to work for a landlord from thirteen until liberation.
热心网友
"When" is to modify "he"The sentence should be written as, "He began to work for a landlord when he was thirteen years old until the liberation." However, you can ingore the "he" after "when" since it is repeative.
热心网友
liberation是中国1949年解放的专有名词，要加the并且开头字母大写。而且建议加when，听着舒服。
热心网友
不加的话句子不通啊！除非说he began to work for a landlord at 13 until liberation.