TASK DEFINITION: You will be given a sentence. Check whether the sentence is grammatically correct and is meaningful. If the sentence is grammatically correct, then answer with '1', otherwise answer with '0'.
PROBLEM: To whom did you send the package?

SOLUTION: 1

PROBLEM: Who do you think that has given the tickets to Bill?

SOLUTION: 0

PROBLEM: If so, I've lost $500.

SOLUTION:
1