英语完成时语法问题：这个句子：I have studied English for five years.的意思是下面的

I have studied English for five years __________ I was ten y They have studied English for about five years.（保持原句意思不变） I have studied English for five years.(转为同义句）, 改正句子中的错误.i have studied English for three years since i had I have studied English for 7 years.(同义转换) I have studied English for 7 years.同义句 we have learned english for (n ) five years根据首字母提示,完成句子. he has studied English for five years 同意句是什么 改错：we have studied English for about six years since I have 把下面句子改为被动句I have learned English for about two years English I have studied English for three months. What's more ,I have studied English for seven years 转化为同义句