1 We use a lot of discourse markers in spoken language for a number of different purposes.
2 If we want to make it clear that we are talking about a result or outcome, we can use phrases
like as a result.
Her arguments were very convincing and as a result I changed my opinion.
3 To show we are giving an opinion we can use a phrase like as far as I’m concerned, to be honest, to tell you the truth or if you ask me.
If you ask me, this government is doing everything wrong.
4 To show that we’re changing the topic of a conversation, we can use a phrase like by the way.
Yes, the concert was great. By the way, have you heard the latest CD they’ve released?
5 We can show a contrast using a phrase such as on the other hand, nevertheless or that said.
She’s a great singer. That said, her choice of songs isn't great