之所以...是因为 Test sentences

之所以今天天气非常冷是因为风从南方吹来.
之所以你会开车慢是因为我会生病在你的出租车。
之所以香港工资高是因为居住在那里是非常昂贵的。
人们之所以过马路在这里是因为交通是很慢的。

The reason why is is cold is the wind is blowing from the south.
The reason why you need to drive slow is because I will be sick in your taxi.
The reason salaries are high in Hong Kong is because it is expensive to reside there.
The reason why people cross the road here is because the traffic is slow.