Her eyes flickered over the last character in the unfolding drama, trying to ascertain his identity.

Just as he'd anticipated, though, she had ascertained his identity quickly.

They might never ascertain her true identity.

We would like to ascertain the dead man's identity.

We wish to inspect your companion, to ascertain his identity.

Allowed the police to forcefully obtain fingerprints and other identifying features from an individual to ascertain their identity.

Finally Matteo cautiously opens the window partway to ascertain their identity.

How to attach security tokens to ascertain the sender's identity.

She needed only a profile to ascertain the intruder's identity.

Having ascertained her identity, he promptly lost interest in her and began to inspect the room yet again.