(a) He lost one full year of his studies.
He was out of the country (as)
(b) The car is fast. The aeroplane is faster. (than)
(c) He could not pay the fee. He had no money. (because).
(a) He lost one full year of his studies as he was out of the country.
(b) The aero-plane is faster than the car.
(c) He could not pay the fee because he had no money.
(b) The aero-plane is faster than the car.
(c) He could not pay the fee because he had no money.
