To say you're in a relationship you say "Jag är i ett förhållande."
Or you could say you already have a boyfriend/girlfriend: "Jag har redan en pojkvän/flickvän."
"Love is watching someone die" is "Kärlek är att se någon dö" in Swedish.
And is "och" in swedish.
På svenska
Surprise is överraskning in Swedish.In Swedish you don't yell "överraskning!", as you would yell "surprise!" in English, when surprising someone. Instead you can say "grattis!" which means congratulations, or something similar that fits the occasion.
Family reunion is familjeträff ("family meeting") in Swedish, as far as I know. If someone knows a more fitting term, please add it here.
"King" in Swedish is "kung".
Equality is "jämlikhet" in Swedish.
School is skola in Swedish.
Adventures is äventyr in Swedish.
29 is tjugonio in Swedish.
Small is liten in Swedish.
Vacation is lov in Swedish.