1. In my opinion/view 通常用来讨论较重要的事情

In my view, our performances at the moment have been affected by tiredness.

在我看来, 我们此刻的表现都是因为太累了。

2. It seems to me/All things considered 常用来表达经过深思熟虑后的意见 

It seems to me that this crime was foreseeable and that this death was preventable.

在我看来，这起犯罪本来是可以预见的，受害者的死也是可以避免的。 

All things considered, I think we made a wise choice in recruiting James.

全面考虑后，我觉得录用詹姆斯是一个明智的选择。

3. I suspect that...表示疑心（较肯定、正向语气）

It implies to the listener that they could disagree and you wouldn't be offended.

这个短语通常暗示对方，你可能并不同意他的观点但你并不觉得这么说会冒犯。 

I suspect that he was lying. 

我疑心他在说谎。

4. I wonder if... 表述一个你认为可能正确的想法

It says you're contemplating if your statement is correct, and encouraging the listener to tell you their opinion. 

这个短语通常用来表达自己的观点同时鼓励对方告诉你他们的意见。 

I wonder if you'd be kind enough to call him.

请你给他打个电话好吗？

5. To be honest/To tell you the truth/To be frank 如果需要说些不讨喜的话 

To tell you the truth, your plan is unrealistic.

恕我直言, 你的计划不太现实。 

To be honest, the house is not quite our style.

说实话，这房子我们不太喜欢。 

To be frank, I don't like him.

坦白讲，我不太喜欢他。