English grammar quizzes: past perfect continuous

The past perfect continuous is formed using had + been + present participle. Questions are indicated by inverting the subject and had. Negatives are made with not.

• Statement: She had been waiting there for more than two hours when her taxi finally arrived.

• Question: Had she been waiting there for more than two hours when the taxi finally arrived?

• Negative: She had not been waiting there for more than two hours when the taxi finally arrived. https://www.englishpage.com/verbpage/pastperfectcontinuous.html

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