(Good morning, afternoon, evening)

I'm happy to be here.

I'm glad to have this opportunity to . . .

Today, I'd like to talk (to you) about . . .

My topic today is . . .

The focus of my remarks is . . .

I'd like to share some thoughts on (topic)

Main points
Let me start by . . .

First, let me tell you about . . .

I've divided my topic into (three) parts: (They are . . .)

Giving examples
For instance,
Let me illustrate,

To illustrate,

Conclusion
In conclusion,

To conclude,

To summarize,

To sum up,