Time clauses can refer to the past, present, or future.

时间状语从句可表示过去、现在和将来。

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She raised concerns about the possibility of government ministers being able to tamper with the royal charter through the Privy Council at any time and urged clauses in statute providing this could not happen.

BBC: Labour: Conservative royal charter 'dilutes' Leveson

Expand Medicaid today and pocket the 100% funding Washington is dangling in front of them for a time, but include so-called "sunset" clauses that would rescind the new coverage if Medicaid proves too costly or if the feds renege on their free-money promises.

WSJ: Review & Outlook: New Medicaid's Roach Motel

Moreover, I am asserting my readiness to submit, at a later time, an (additional) request to change any other clauses referred to me by the constitutional committee, according to the needs and justifications it sees fit.

BBC: Egypt unrest: Full text of Hosni Mubarak's speech