Cau nay duoc hoi qua nhieu roi => bam vao cau hoi tuong tu

1. They go to school.
=> What do they go to ?

2. He is listening to music at the moment.
=> What is he listening to at the moment
=> When is he listening to music ?

3. I can speak English.
=> Which language can you speak ?

You had __better____ not eat too many candies because they are not good for your teeth.

There are some trees to _the__ left of the store.

of

WHich is the biggest city in VietNam ?

S =  [(1+2) + (5 +6) + (9 +10) + ...+ (993 + 994) + (997 + 998)] - [(3 +4) + (7 +8) + ...+ (995 + 996)]

= (3 + 11 + 19 + ...+ 1987 + 1995) - (7 + 15 + ...+ 1991)

Tính A =  3 + 11 + 19 + ...+ 1995

Dãy trên có (1995 - 3) : 8 + 1 = 250 số

Tổng A =  (3 + 1995). 250 : 2 = 249 750

Tính B = 7 + 15 + ...+ 1991 

Dãy trên có (1991 - 7) : 8 + 1 = 249 số

B = (7 + 1991) . 249 : 2 = 248 751

Vậy S = 249 750 - 248 751 = 999

It is'n important for you to finish the work today

=> You don't have to finish the work today

We enjoy playing football very much

=> We are interested in playing football