2 since the morning
   for 4 hours
3 since i was born
    for a long time
4  since 2015
     for  10 years
 5 since i was grade 1
     for 20 years

for + khoảng thời gian 

since + mốc thời gian

-----------------------------------------------------

2.

since this afternoon

for six hours.

3.

since 2010

for 13 years.

4.

since 2021

for 2 years.

5.

since August

for 3 months

`color{orange}{~LeAiFuRuiHuiBao~}`