因而

天气预报说会下雨，因此我们带了伞。

tiānqì bàoyù shuō huì xià yǔ, suǒyǐ wǒmen dài le sǎng.

As the weather forecast predicted rain, so we took umbrellas

他没有复习，因此考试不及格。

tā méiyǒu xíféi, suǒyǐ kǎoshì bù jígé.

He didn't review, so he failed the exam