"Does English have dipthongs?"
"As in two vowels together making a single sound? Sure. Take the 'ou' in 'around' or 'about', for example. Another dipthong would be 'ea', which is pronounced… is pronounced… uhm, like 'ea' as in 'bear' or like 'ea' as in 'feat' or like 'ea' as in 'great'."
The concept is far easier in Norwegian. Trust me on this.