ascertains is a form of:

Ascertain



1.
(Get to know, find out for a certainty, discover, determine) ធ្វើឲ្យបានដឹងជាប្រាកដឡើងដោយប្រើមធ្យោបាយផ្សេងៗ, សំគាល់ឃើញ, កត់ត្រាទុក, ពិនិត្យកត់ត្រា, ស៊ើបអង្កេត, សួរដំណឹង, ស៊ើបដំណឹង
Example: I want to ascertain the truth.
Example: The police are trying to ascertain what really happened.
ENGLISH MEANING
verb
1.
(TRANSITIVE) To render (a person) certain; to cause to feel certain; to make confident; to assure; to apprise.
2.
(TRANSITIVE) To make (a thing) certain to the mind; to free from obscurity, doubt, or change; to make sure of; to fix; to determine.
3.
(TRANSITIVE) To find out or learn for a certainty, by trial, examination, or experiment; to get to know; as, to ascertain the weight of a commodity, or the purity of a metal.
1.
detect, devise, discover, expose, find out, invent, learn originate, reveal
1.
cover, hide, lose, mask, screen