Get to know them first, then do romantic interactions, and then ask them out.
nope!
To become a business partner in the Sims 3, all you have to do is click on the place that you want to partner and click the interaction "Become Partner for $......." To become a partner costs A LOT of simoleons so make sure you have enough money to do so.
Get divorsted !! And then move in with someone elese.
Once you are with someone you should be their partner go on bee romantic and scroll down and it will say woo hop also on sims 3 ambitions you can try for a baby but you have to be I'm a happy mood
You get access to more stuff.
You have to keep doing freindly and romantic interactions with the sim
On the sims 3 on the 3DS you can marry someone and on the DS I/LITE you cannot.
It is IMPOSSIBLE on sims 2 but on sims 3 you can go to someone Else's house. Hope that helps!
A sim can be married to one sim, whilst dating another. But be careful you don't get caught, it can completely ruin a relationship.
What are you having trouble with?
if you want someone else to live at your sims house in sims 3, go to edit town, and then choose the household and click on the other household you want them to merge with.
You need to become more romantic with your partner :D