Modal Verbs (ได้, ต้อง, ควร, น่าจะ)

Express ability (ได้), obligation (ต้อง), advisability (ควร), and probability (น่าจะ). Learn how to stack modals, negate each one correctly, and distinguish between ได้ as "can" placed before the verb versus ได้ as a past or resultative marker placed after the verb.