雅思口语 连接词之原因

确定的原因：

Mainly because...主要因为

Primarily because...主要因为

The reason for this is...原因是

The basis for this is... 这个的依据是

This is due to ...这归结于

Due to..., 由于...

The explanation for this is ...关于这个的解释是...

不是很确定的原因：

This may be due to...这个也许是由于...

One reason might be that...大概有一个原因是...

The underlying cause could be ...起因可能是...

It's possible that ...或许是...

I assume that... 我假设是...

There's the possibility that...可能是...