...From that time Ayrton shared the common life, and madehimself useful on all occasions; but still humble and sad, he never tookpart in the pleasures of his companions... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...It would be better to leave them here, for he mightfind them useful later on...
Various 「Astounding Stories, August, 1931」
...If theyoperate they will remove from your brain every speck of memory youhave of past events, leaving only those things that will be useful toSaranoff...
Various 「Astounding Stories, August, 1931」
... “A very useful fellow, isn’t he? ...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...As a matter of fact, Chauvelin had ceasedeven to think of her: she had been a useful tool, that was all...
Baroness Orczy 「The Scarlet Pimpernel」
...All that is really noble and really useful in this world will find its account therein...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...“The knowledge may be useful...
Rafael Sabatini 「Scaramouche」
...“It can be useful upon occasion,” said he, and went off to his dressing-room to change...
Rafael Sabatini 「Scaramouche」
...“A most useful member of our party, at present disguised as aninfirmier in Lady Manorwater’s Hospital at Douvecourt...
John Buchan 「Mr. Standfast」
...“Such manners were useful enough, perhaps, in days when the divided nobility had no other rallying-point than mere gallantry...
Alexandre Dumas, Pere 「Louise de la Valliere」
...Here are a few certificates of safety; I have been making a collection of them for some time, as they are always useful...
Baroness Orczy 「El Dorado」
... “Citizeness Candeille will please accept this gift from the government of France in acknowledgment of useful services past and to come...
Baroness Emmuska Orczy 「The Elusive Pimpernel」
...“He’ll be very useful, and you can rely on him absolutely...
Anthony Hope 「Rupert of Hentzau」
... Artless statements are as useful in their way as artless questions...
Talbot Mundy 「King--of the Khyber Rifles」
...By these means I becamevery useful to my master; and saved him, as he used to acknowledge,above a hundred pounds a year...
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
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