He arrived before I did.
After I have finished studying, I intend to work abroad.
As the climate gets hotter, sea levels will rise.
I will keep learning English for as long as it is necessary.
While I am studying, I usually listen to the radio.
Rates of obesity increase when too much junk food is eaten.
Since I started going to fitness, I have lost 5 kilos.
I will keep learning English until I am upper intermediate.