What are the basic requirements for an F-1 to reenter the United States after traveling abroad on pleasure or personal business?
This section of the FAQ applies to continuing F-1 students who travel outside the United States for five months or less.
After you receive your conditional green card what is next?
Off hand, I can think of two types of conditional green cards: marriage-based and investment-based. In both instances, eventually you have to apply to get the condition removed.