1. INTRODUCE YOUR TOPIC

-My cause for concern is...

-I want to talk about X because 

2. GIVE THE REASON WHY

-Let me explain why...

-Two years ago...

-I´ve always been interested in...

3. LIST YOUR RESEARCH

-Research shows that...

-A recent study found that...

-I read in the newspaper/heard on the news that...

4. INTRODUCE NEW POINTS

-I have two more concerns. Firstly, ... secondly, ...

Another thing is...

5. CONCLUDE

-Finally, I´d like to say...