Here are some of the most common ones:
* Phineas and Isabella: This is probably the most popular ship, given Isabella's obvious crush on Phineas and their frequent interactions.
* Ferb and Vanessa: These two often share a subtle connection, with Vanessa even flirting with Ferb in some episodes.
* Candace and Jeremy: These two are dating, though their relationship is mostly comedic fodder for Candace's attempts to bust her brothers.
* Baljeet and Buford: While not romantic, their friendship is often portrayed as close and even a bit "bromantic."
It's important to remember that the show primarily focuses on the adventures of Phineas and Ferb, with romance taking a backseat. The creators haven't officially confirmed any romantic relationships, leaving it open to interpretation.