Kari lea mirané terues--Carrie held the cat.
Kari Shanud lea mirané thenues--Carrie gave Shawn the cat. (At which point Shawn had an allergy attack and died, but we don't need to go into that. ;)
Sentences containing relative clauses use the pronoun dem at the beginning and end of the clause. Note that the relative clause is an entire sentence with a pronoun replacing boy, and that it goes immediately after the noun it describes:
ale lea ressod dem ale belut fo dem lea mirané terues--I gave the cat to the boy who I saw. (I the boy who I saw him the cat gave)
Yes-no questions are easy. If you're wanting or expecting the answer to your question to be "yes," add the particle zic to the beginning of the sentence; if you'd rather it were "no," add zin:
Other questions get more interesting.