谁能帮我把下面的句子找错误,
1.Have you had good weather last weekend
2.he has taken his medicine an hour go .
3.i have seen Sam and Tim yesterday.
4.I'm already waiting for half an hour.
5.We have this house since 1998.
6.Who has given you that lovely hat?
7.That's a nice picture.Have you painted it yourself?
8.We've havingour new car for four days.
9.I have fallen down a minute ago.