

1, They/ spend/ all day/ practise/ song/ they/ sing/ Lan’s next birthday/.
=> They have been spending all day practising the song which they will sing on Lan's birthday
Đáp án thì dùng quá khứ đơn "spent" nhưng mình dùng hthttd đc ko ạ?
=> They have been spending all day practising the song which they will sing on Lan's birthday
Đáp án thì dùng quá khứ đơn "spent" nhưng mình dùng hthttd đc ko ạ?