Tìm lỗi sai, giải thích lý do sai và cách sửa cho đúng: 1) Since 1984 the sport has included in the olympic games as part of the yachting events. 2) By the time joan arrived, all of the food had eaten. 3) The weather this year is much hotter than 2005

Tìm lỗi sai, giải thích lý do sai và cách sửa cho đúng
1. Since 1984 the sport has included in the olympic games as part of the yachting events
2. By the time joan arrived, all of the food had eaten
3. The weather this year is much hotter than 2005
4. The final exam was the more difficult than the mid-semester exam
5. The custorms in his country are more traditional than that in the united states
6. Many optimist  people have made prediction about the positive impact of the increasing mechanization on human life