I have recently been watching some japanese programmes and whilst watching, I noticed that sometimes the 'u' at the end of a sentence was stressed and other times it wasn't (therefore sounding more like 's'.
I have been working my way through the beginner podcasts and it always seems, for example, "Arigatou gozaimasu", is pronounced with the 'u' at the end, silent and tends to sort of extend the 's' sound.
However, in the programme I was watching the speaker tended to occassionally stress the 'u' at the end of the scentence, therefore making the 'su' sound at the end.
I was jut wondering if there was any specific reason for this.
Sorry if this is a really silly question.
Thanks in advance for you help.