If any exist they ought to be ascertained and guarded against.

This remained to be ascertained in exploring that river upwards.

I think I have a clue by which his address may be ascertained.

Of my father, I knew nothing; I have since ascertained he must then have been dead.

The precise occasion of this offence cannot, and need not, be ascertained.

From all who are about me, you are certain (I have ascertained it) of a generous welcome.

The truth, as in most questions of history, remains for ever in the balance, and cannot be ascertained.

Alone and unassisted he first ascertained by personal inquiry the extent of the evil.

I had ascertained the exact point at which the little churchyard lay.

Here he got a bed, and here he ascertained that the Electra had not yet arrived.