常用引导词：because, since, as, since
特殊引导词：seeing that,  now that,  in that, considering that,  given that, considering that, inasmuch as, insomuch as
                My friends dislike me because I’m handsome and successful.
Now that everybody has come, let’s begin our conference.
The higher income tax is harmful in that it may discourage people from trying to earn more.
Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.

这些东西在实际应用中才有价值。