Student or Learner
How many of you know or How many of you knows. Which one is correct.
On Israel, On Egypt, On Japan, I have heard such usages.
On or In which one is correct
People who are not native speakers and/or teachers are welcome to post answers in this forum. However, if you only think you know the answer, I would suggest that you wait some hours before you post. If no teacher or native speaker posts within a few hours, your thoughts will be helpful. If you post too soon, with 'I think', most readers will be waiting for confirmation from a teacher.
Edmondjanet, please give more context. On Israel is possible in some situations, for example: Several attacks were made on Israel last week.