It's good that...

(a)  

I'm sorry that...

(a)  

I'm afraid that...

(a)  

It bothers me that...

(a)  

It's strange that...

(a)  

It's ridiculous that

(a)  

It's a pitty that...

(a)  

I doubt that...

(a)  

I don't believe that...

(a)  

It's possible that...

(a)  

It's not probable that...

(a)  

Perhaps..., Maybe...

(a)  

It's not evident that...

(a)  

It's not certain that.../It's not true that...

(a)  

I deny that

(a)