Complete the sentences with the correct form of the verbs in brackets. Use the Present Perfect Continuous or the Past Perfect Continuous.
1. Mike has never had an accident and he (drive) for years.
2. She had no idea it was so late because she (not / watch) the time.
3. “ (you / take) your medicine regularly, Mrs Smith?” “Yes, doctor.”
4. They eventually found the dog after they (look) for it all night.
5. How long your father (work) for the company when he retired?

1. Mike has never had an accident and he has been driving for years.

Explanation: In this sentence, we use the Present Perfect Continuous tense because it emphasizes the duration of Mike's driving experience. The action of driving started in the past and is still continuing in the present. The structure of the sentence is "subject + has/have been + verb-ing" to indicate that an action has been happening continuously over a period of time.

2. She had no idea it was so late because she hadn't been watching the time.

Explanation: In this sentence, we use the Past Perfect Continuous tense because it describes an action that started in the past and continued up until another point in the past. The structure of the sentence is "subject + had + not been + verb-ing" to indicate that an action had been happening continuously in the past before a specific point.

3. "Have you been taking your medicine regularly, Mrs. Smith?" "Yes, doctor."

Explanation: In this sentence, we use the Present Perfect Continuous tense because it emphasizes the continuity of the action of taking medicine. The question is asking about a past action that is still relevant in the present. The structure of the sentence is "subject + have/has been + verb-ing" to indicate that an action has been happening continuously over a period of time.

4. They eventually found the dog after they had been looking for it all night.

Explanation: In this sentence, we use the Past Perfect Continuous tense because it describes an action that started in the past and continued up until another point in the past. The structure of the sentence is "subject + had + been + verb-ing" to indicate that an action had been happening continuously in the past before a specific point.

5. How long had your father been working for the company when he retired?

Explanation: In this sentence, we use the Past Perfect Continuous tense because it describes an action that started in the past and continued up until another point in the past. The question is asking about the duration of an action that had been happening continuously before a specific point in the past. The structure of the sentence is "how long + had + subject + been + verb-ing" to inquire about the duration of an action in the past.