Simple past (Quá khứ đơn) → Present perfect (Hiện tại hoàn thành)

a/ They began wearing “Ao dai” 2 months ago.
b/ They started living in Hue when they were ten.
c/ We began to collect stamps 2 years ago.
d/ He moved to HCM in 1918.
e/ They bought a new computer last month.
f/ We stared to learn French last year
g/ Lan finished her homework five minutes ago
h/ We left school in 1998.
i/ I started learning Math an hour ago.
j/ Tim had his report card yesterday.
k/ They had this car 10 years ago.
l/ We knew each other when we were students.
m/ She started teaching in this school when she graduated from the University.
n/My father stopped smoking two years ago.