Assure
Give assurance.
Roman:
Yakeen dilana.
Example:
I can assure you.
Me apko yakeen dilata hon.
Me apko yakeen dilata hon.

Ensure
To make sure.
Roman:
Paka karna / Yakeeni banana.
Example:
Please ensure that accurate records are kept.
Paka karlen ke sahi record rakhna hai.
Paka karlen ke sahi record rakhna hai.
Insure
Buy insurance.
Roman:
Beema lena.
Example:
The car is insured.
Car ka beema hai.
Car ka beema hai.