英语单句改错是英语语法学习中的重要练习，主要考察对语法知识的综合运用能力。以下是常见错误类型及正确改法：
一、介词使用错误
错误 ：We reached to the village, it had been dark. 正确
：We reached the village, it had been dark.
解析：reach是及物动词，后面直接接地点名词，无需加介词"to"。
错误：
The teacher entered to the room with a ruler in her hand.
正确：The teacher entered the room with a ruler in her hand.
解析：enter是及物动词，表示"进入"时不需要加介词"to"。
错误：
On hearing the news, the murderer fled from Hong Kong.
正确：On hearing the news, the murderer fled to Hong Kong.
解析：表示"逃往"某地需用介词"to"。
二、动词形式错误
错误：
We should serve for the people heart and soul.
正确：We should serve the people heart and soul.
解析：serve是及物动词，后面直接接宾语，无需加介词"for"。
错误：
The girl married with an American banker.
正确：The girl married an American banker.
解析：marry是及物动词，表示"与某人结婚"时不需要加介词"with"。
错误：
The mother dressed for her son.
正确：The mother dressed her son.
解析：dress是及物动词，表示"给某人穿衣"时用"dress sb."结构，而非"dress for"。
三、主谓一致错误
错误：
Everyone of us is working hard in the factory.
正确：Everyone is working hard in the factory.
解析：everyone作主语时，谓语动词用单数形式，无需加"of"。
四、代词与副词使用错误
错误：
I do remember you having apologized to the old lady I met her last week.
正确：I do remember you apologizing to the old lady I met last week.
解析：remember后接动词时需用动名词（-ing形式），且"met"后直接接宾语，无需加"her"。
错误：
Do you know the person who she is standing over there？
正确：Do you know the person who is standing over there？
解析：定语从句中，当先行词为"the person"时，关系代词用"who"或"that"，且需用现在分词"standing"作后置定语。
五、其他常见错误
时态错误 错误：The old man is a very determined person. Even if he knows he is wrong, he doesn’t want to change. 正确：The old man is a very determined person. Even if he knows he is wrong, he doesn’t want to change. 解析
冠词使用错误：
错误：This is the steel plant where we visited last week.
正确：This is the steel plant we visited last week.
解析：当先行词被定语从句修饰时，关系代词（如"which"）可省略冠词"the"。
总结
改错时需结合句意和语法规则，注意动词搭配、主谓一致及介词使用。建议通过大量练习巩固，可参考权威资料或语法解析工具辅助学习。