10. .... how long I had been standing there (CT câu TTGT, lùi HTHT về QKHT, here thành there)
11. ...  looking after my bicycle while I'm away for a while? (sau mind + V-ing, look after = take care of chăm sóc)
12. Many people think DN City is the cleanest city in VN (CT so sánh hơn nhất)
13. Since it rained heavily, we cancelled.... (CT Since + Mệnh đề, mệnh đề: bởi vì...,...)
14 David gets on well with most of his colleagues (get on well with có MQH tốt với ai)
15 Did you use to eat sweets when you were small? (cấu trúc used to + V: từng làm gì)