1,Tom asked his teacher if scientists had found water on Mars.

(chuyển từ quá khứ đơn sang qk hoàn thành vs cấu trúc:S+asked+O if/wether +S+had V)

2,Dean asked his father if astronomers has discovered any planets similar to Earth.

(chuyển từ hiện tại hoàn thành sang qk hoàn thành vs ấu trúc S+asked O+if+S has/have+V)

3, The litter boy asked his mother if they would be able to live on Saturn in the next decade.

(đổi will thành would nên dữ nguyên V(nt) vs cấu trúc S+asked+O if S+would+V)

4.Nick asked his teacher what would happen if the sun became cooler.

(chuyển will thành would,còn V sau if thì chuyển thành Vpp lùi thì)

5,The science teacher asked her students how many planets there were in the Solar System.

(chuyển từ hiện tại đơn sang quá khứ đơn vs cấu trúc S+asked+O how/what/... S +V)

6,Alex asked his friend how long Neil Armstrong had stayed on the moon

(chuyển từ quá khứ đơn sang qk hoàn thành vs cấu trúc S +asked+O how/what/+s+v)

HỌC TỐT NHA !!!