1) Mr.John has been principal of our school since last year(HTHT,DHNB: since)
2) Violets bloom in Spring(HTĐ, DHNB: Đây là 1 điều hiển nhiên)
3) We haven't live in England for 2 years now(HTHT, DHNB: for)
4) They are preparing the Christmas dinner at home now(HTTD, DHNB: now)
5) George has worked at the university so far(HTHT,DHNB: so far)
6) She has learned German for 2 years((HTHT,DHNB: for)
7) Tom moved to this town in 1994(QKĐ, DHNB: in)
8) Look! That man is trying to open the door of your car(HTTD, DHNB: look!)
9) Listen! They are learning a new song(HTTD, DHNB: Listen!)
10) Martin cycled for 50 miles on scenic routes three weeks ago(QKĐ,DHNB: ago)
11) David is repairing the TV set at the moment(HTTD,DHNB: at the moment). He has worked at it for one hour(HTHT,DHNB: for)
12) I can't go with you because I haven't finished my homework yet(HTHT,DHNB: yet)
13) John is washing his hands now(HTTD,DHNB: now). He has just repaired the bike(HTHT,DHNB: just)
14) My friend was in Canada two years ago(QKĐ, DHNB: ago)
15) Three people visited him in hospital last Friday.(QKĐ, DHNB: last)
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