Yes you do, the expansion packs won't work without the base game.
no, you do not need your Sims 3 disk, but you will need the disk for the expansion pack you want to install.
You cant, you must have an original sims game to install a expansion pack.
If by "other games" you mean the expansion packs, then yes. In order to install the expansion packs (Sims 2 University, etc.) you need to have Sims 2 already installed. If you don't want to spend money on that game as well as the expansion pack, find a friend who has the Sims 2 discs, and borrow them. Install the game and then install your expansion pack right afterward. That way, you don't need the regular Sims 2 disc to play with your expansion pack. You just have to have the disc for the expansion pack you installed. (However, if you ever have to uninstall the game, you'll need to borrow Sims 2 again to reinstall it.)
It's not an expansion pack, so it doesn't need any other sims games for it to install and work.
yes but you need to go to store and buy it
It's a Sims 2 expansion pack so you need Sims 2.
As it so happens yes. Hence SIMS 3 EXPANSION pack. Install it exactly how you installed sims 3.
all you need is the expansion, first you install it and then every time you want to play the game you put in the latest expansion disc you installed
you need the pet expansion pack
No because you need a base game to play it on.
Yes you do, because the Sims 3 Ambitions is an expansion pack, which means it is a feature you install on the game it is made for.
No because sims 2 freetime is an expansion pack.