It is high time the government had took action against corruption.

• Correct answer: It is high time the government took action against corruption.
- It is high time এর পর subject (the government) থাকায় পরবর্তী verb টি past Indefinite Tense এ হয়।

• It is time/ It is high time:
- It is time/ It is high time এরপর যদি subject থাকে তাহলে পরবর্তী verb টি past indefinite tense এ হয়।
- কোনো কিছু করার এখনই উপযুক্ত সময় অর্থে It is time/ It is high time ব্যবহৃত হয়।
- Example sentence: It is high time you took responsibility for your actions.

• তবে It is time/It is high time এরপর যদি subject না থাকে তবে to + verb হয়।
- Example sentence: It is high time to give up smoking.

Source: Advanced Learner's Communicative English Grammar and Composition by Chowdhury and Hossain.