1.doesn't really begin DHNB: until late November
2.to happen
3.had gone câu tường thuật quá khứ đơn lùi 1 thì thành QKHT
4.was originally designed
5.are still searching
6.has visited DHNB:three times this year
7.was playing DHNB: when it suddenly began to rain
8.getting DHNB:as soon as