Giups em bài này vs ạaaaaaaaaaaaaâ Chuyển sang câu tương đương : English is difficult to learn = it is...... = To learn.... 2. You should learn these words by heart = These words..... 3. It started rainning at 4 o'clock = It has...... 4. Duty-free goods can be bought here = People..... 5. Nobody has used this computer for a long time = This computer..... 6. Air travel is faster than othẻ kinds pff transport = Air travel is the...... 7. The last time I ate chocolate was in 2015 = I haven't.... 8. The water was too cold for the children to swim in = The water wasn't......