The phrase "ascertain the grounds" is correct and usable in written English.
It can be used when you want to determine the basis or reasons for something, often in a formal or investigative context.
Example: "Before making a decision, it is essential to ascertain the grounds for the complaint."
Alternatives: "determine the basis" or "establish the reasons".
Rep. 752, it was held that this court might examine the opinions of a state court, delivered and recorded, to ascertain the ground of its judgment.
More than once during the hearing the Committee took particular pains to ascertain the precise grounds upon which petitioner was refusing to testify.
The House intelligence committee report said that "some Annex team members wanted urgently to depart the Annex for the TMF to save their State Department colleagues," but the Annex chief "ordered the team to wait so that the seniors on the ground could ascertain the situation at the TMF and whether they could secure heavy weaponry support from local militias".
But the CIA annex chief "ordered the team to wait so that the seniors on the ground could ascertain the situation at the TMF and whether they could secure heavy weaponry support from local militias," the report said on page 20.
UNICEF works with NGOs to ascertain the situation of children on the ground and find ways to best help them.
Personnel are urged to open lines of communications as early as possible with the appropriate authorities to ascertain the correct requirements for any ground support equipment that might be required.
But, as is well know, such indivisibilists accounts were generally so defensive in their posture arguing for the mere possibility of indivisibles that it is difficult to ascertain the broader philosophical motivations which grounded such arguments.
One judge overruled the ban applied by a private university against the face-concealing niqab, on the grounds that personal freedom counts more than the university's right to ascertain the identity of its students.
Use a voltmeter or preferably a voltage sensor to ascertain the voltage on all colors of wire in the box or circuit with respect to ground.
A comparative theoretical analysis has been conducted to ascertain the feasibility of a 'Membrane Conduction Augmentation System' (MCAS) to improve performance relative to a conventional Horizontal Ground Coupled Heat Exchanger (HGCHE).
