In order to soften our opinion, we say
Creo que... – I think...
Me parece que... – It seems to me that...
A lo mejor... – Perhaps...
La verdad es que... – It´s just that...
In order to make more intense our words, we say
Pues sí / Pues no – Yes,
of course / Of course, no
Claro que ... – It´s clear that...
In order to avoid our opinion or finish the conversation, we say
Bueno... – Ok then