Tìm lỗi sai trong các câu sau:
1. I haven't seen my grandparents since=> for a quarter of a year
2. A new shop was opening=> opened on Msin Street last week
3. His teacher encouraged him talking=> to take part in the competition
4. My family used to be having=> having dinner at 7 o'clock in the evening
1. since -> for
2. opening -> being opened
3. taking -> to part
4. be having -> have