Übersetzung - Türkisch-Englisch - ütü yapmaliyim

must be that:i must do ironing

tks!

must and have to are both more formal usage of english.
go to do is more-like daily language.
you can use tree of them. there is no such distinction in turkish. ( there are things to cut the point out but in a different way)
bye

thank you so much!

I've to iron