Mobile phones should be banned at schools
To start with... First of all, ... /Firsty... Secondly...Another thing is that...
More generations together means more knowledge of life
I think (that)... In my view/ opinion... I'm convinced/positive that... To my mind...
Under the age of 25, driving licence shouldn't be allowed
On the one hand ....but on the other hand ...
Many young people think, it's better to remain single rather than get married
Well, the thing is that... It's also true that ...And on top of that...And finally...