This document discusses the different uses of the word "will" in the English language. It can be used to make a promise, state a fact about the future, or make a prediction. "Will" can also be used to make a decision at the time of speaking. The document contrasts using "will" with using phrases like "I think", "I hope", or "probably" which indicate less certainty about the future. Finally, it discusses the uses of "be going to" to indicate a future plan or prediction based on evidence, compared to discussing future plans using phrases like "going to" or "gonna".