please answer these questions

4. What is the difference between subleasing and assignment? When is subleasing desirable for the existing tenant? 5. What do the terms covenant of quiet enjoyment and warrant of habitability mean? 6. Do expense stops limit the expenses paid by the landlord or the tenant? 7. Based on the Legal Highlight involving Dr. Luck on page 156, are landlords liable for injuries suffered by guests of tenants ? 8. What purpose do security deposits serve from the Lessors point of view. 9. What is the difference between a negative renewal clause and a positive renewal clause? 10. Al's Shoe Store has a percentage lease that requires a base rent of $2,000 per month, plus 2% of monthly gross sales over $10,000. What will the rent be when the monthly gross sales are $18,000