OK, lotsa complicated stuff this time.
First, we cover using "who" vs. "that" in a sentence, as in "I'm the one who loves you" vs. "I'm the one that loves you."
And we move on to "that" vs. "which" in restrictive and non-restrictive clauses. (You might want to get some paper to draw a diagram here.)
And we learn when to use "shall" vs. "will."
Or if any of it matters at all!