The phrase "ascertain they" is not correct in written English.
It seems to be an incomplete expression and lacks proper grammatical structure.
Example: "We need to ascertain they have completed the task."
Alternatives: "determine if they" or "verify that they".
Young participants received cognitive debriefing to ascertain they understood the questions.
Furthermore, the inclusion criteria had to be clear to non-medical personnel, to ascertain they could identify the eligible children.
All participants will receive a follow-up phone call half way through W2-W4 to ascertain they have filled out questionnaires after each visit.
As far as we could ascertain, they had no natural significance for mice and they had never been associated with reinforcement.
All plasmid-constructs were sequenced to confirm the presence of the inserted DNA segments and to ascertain they were free of errors.
In this paper, we aim to show that while individual modest genetic effects are difficult to ascertain, they can be collectively identified by combining nominally significant evidence of genetic association with current knowledge of biochemical pathways.
Next on their agenda appears to be our republic which from what I have ascertained they would like to remake into a two-tier quasi-theocracy with kingly powers vested in the executive.
We excluded 7 residents from analysis because their retrospective falling status could not be ascertained (they had not lived in the facility for a year prior to testing).
However, using non-random sets of the genome for evolutionary inference has potential to bias estimates of divergence and historical demography because depending on how these loci are ascertained, they might show idiosyncratic patterns from the rest of the genome.
They must ascertain that they have the right person (and not, for example, a roommate borrowing a screen name), compile evidence and obtain search warrants before making an arrest.
For all deaths to women of reproductive age they ascertained whether they could be classified as maternal, pregnancy related or late maternal and if so, verbal autopsies were conducted.
