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: All Mr Collins has done is have praised Lady de Bourg.

SOLUTION: 0

PROBLEM: The writers could so believe the boy.

SOLUTION: 1

PROBLEM: Could they have left?

SOLUTION:
1