You want to give your real opinion about something.
To be honest...
You don't particularly enjoy football.
It's not my thing.
Your friend says: "I don't enjoy horror movies."
You understand their opinion and accept it.
Fair enough.
You are excited about your holiday next month.
I'm looking forward to it.
You want to say "in my opinion".
As far as I'm concerned...
You don't like opera very much.
I'm not really into opera.
Someone gives a logical explanation and you understand.
That makes sense
Your friend thinks they won't win the competition.
You want to say anything is possible.
You never know.
You are giving information, but you aren't completely sure.
As far as I know...
You absolutely hate waiting in traffic.
I can't stand waiting in traffic.
You want to start talking about something new.
By the way...
You discover that the rumour was true.
It turns out...
You want to introduce the most important conclusion.
At the end of the day...
You are very enthusiastic about photography.
I'm keen on photography.
Someone mentions Australia and you want to talk about Sydney.
Speaking of Australia...
You don't know why something happened.
For some reason...
You prefer tea instead of coffee.
I'd rather have tea.
Your friend says: "You choose the restaurant."
It's up to you.