used to indicate obligation, duty, or correctness, typically when criticizing someone's actions

used to indicate a suggestion or advice

अनिवार्य, कर्तव्य

English Usage: You should finish your homework before playing.

Hindi Usage: तुम्हें खेल से पहले अपना होमवर्क खत्म करना चाहिए।

used to indicate a probable or expected event

संभावना, अपेक्षा

English Usage: The train should arrive by noon.

Hindi Usage: ट्रेन दोपहर तक आ जानी चाहिए।