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'.

[EX Q]: It's probable that in general he understands what's going on.
[EX A]: 1

[EX Q]: To him presented itself a wonderful opportunity.
[EX A]: 0

[EX Q]: Ions left the electrode.
[EX A]:
1