问题描述：
I have been in ShangHai from 12 July.
这句话有错吗?把from改成since可以吗?
这样写 I have been in ShangHai from three monthes ago.
不好意思上面没写清楚：
I have been in ShangHai from 12 July.这句话对吗？
把from改成since可以吗？
I have been in ShangHai from three monthes ago.这句话对吗？
这句话有错吗?把from改成since可以吗?
这样写 I have been in ShangHai from three monthes ago.
不好意思上面没写清楚：
I have been in ShangHai from 12 July.这句话对吗？
把from改成since可以吗？
I have been in ShangHai from three monthes ago.这句话对吗？
问题解答：
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