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: Who did Mary see walking toward the railroad station?

SOLUTION: 1

PROBLEM: When I am awake at that time and Susan is asleep, Bill will leave.

SOLUTION: 0

PROBLEM: Bill left when I believe the bomb had just exploded.

SOLUTION:
1