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Surveillance is a noun and so doesn't have any tenses. Only verbs have tenses.

*Added by T.Sampson - The person posing the question is likely asking for the past tense of 'surveill', which would be 'surveilled', and present tense which is 'surveilling'....

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Jeanette Kulas

Lvl 10
3y ago

What else can I help you with?