It was certainly useful to have her there to chauffeur him around.

有她在那儿为他开车肯定是有用的。

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They are certainly useful.

他们当然是有用的。

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Full document updates are certainly useful in some situations.

完整的文更新在某些情况下肯定是有用的。

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It certainly is, it still is going to be useful to do thermochemistry.

实际上，这样的物理量在化学热力学中是非常有用的。

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So in this case, I think the intelligence is certainly useful, but if the government of Sudan wants to remain a government in the world, in good standing, then its got to obey international law.

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They will be accepted, though not loved and certainly more useful to the government than the Dome has been.

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Certainly a useful tool, but hardly a transcending (or, quite frankly, original) feature.

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