As/so long as Definition 1 of 2Pro Tip 1/3Conditional Agreement Use when agreeing but expecting something in return or under certain conditions. I'll lend you the book as long as you return it next week. Pro Tip 2/3Implies Trust Signals trust that the other person will meet the conditions set. You can use my phone as long as you don't drop it. Pro Tip 3/3Not a Guarantee The outcome is uncertain but depends on the condition being met. We'll reach on time as long as there's no traffic jam.