After the phrase "It is high time" or "It is time," the following clause must be in the simple past tense to indicate that something should have already been done.

১. Even though the meaning is present or future, the grammatical structure requires a past verb.
২. Using "have acted" or "are acting" is a common error made by learners.
৩. If there is no subject (e.g., "It is high time to act"), an infinitive is used instead.

অতিরিক্ত তথ্য: This structure is used to express urgency or a mild complaint about a delay.