because引導(dǎo)什么從句時態(tài)

because引導(dǎo)原因狀語從句。
例句：
The road is closed because of the snow.
這條路因下雪而封閉。
Many diets fail because they are boring.
許多規(guī)定飲食因單調(diào)乏味都不奏效。