请问如何用英语表达意见？英语口语中与表达观点和意见相关的短语有哪些？

如何用英语表达意见：

As far as I know

I agree with the opinion of …

I could be wrong, but …

I'd definitely say that …

I'd guess that…

I imagine that …

I'd say that …

I'm absolutely certain that …

I'm fairly confident that …

I'm no expert (on this), but …

I'm positive that …

I'm pretty sure that …

It seems to me that …

It's a difficult issue, but …

It's a complicated issue, but …

Some people may disagree with me, but …

This is just my opinion, but …

Without a doubt, …