Question

Answer 1

Nam played piano at 7 o'clock last night 
They will go to HCM city next month

Answer 2

1. Nam played the piano at 7 o'clock last night.

2. They will go to HCM city next month.

Answer 3

1. Nam was playing piano at 7 o'clock last night

2. They will go HCM city next month

Answer 4

Nam played piano at 7 o'clock last night.
They will go to HCM city next month.