Eli5 – How would you explain when to use “I’ll” vs “I will” to someone who isn’t a native speaker?

Question

For example why does it sound unnatural to say “I’ll not use this for profit.”?

In: 0

Answer 1

Make sure they understand that “I will,” as a complete sentence, should never be contracted to “I’ll.”

Otherwise, the nuance between “I’ll” and “I will” is so minor as to be barely worthy of mention. Neither is incorrect.