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Exercise 1: Present Perfect or Present Perfect Continuous

The task is to fill in the blanks with the correct form of the verb, using the Present Perfect Continuous when possible and the Present Perfect Simple elsewhere. Let's solve each sentence step by step:

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#### 1. I __________ (lose) my key. Can you help me look for it?
- Analysis: The action of losing the key is a completed action in the past, and there is no indication that it is ongoing or related to the present moment.
- Tense: Present Perfect Simple
- Solution: have lost

Answer: I have lost my key. Can you help me look for it?

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#### 2. I __________ (read) the book you gave me, but I __________ (not finish) it yet.
- First Blank: The action of reading the book started in the past and is still ongoing (implied by "but I __________ it yet").
- Second Blank: The action of finishing the book has not been completed yet, so it is an incomplete action up to the present.
- Tenses:
- First blank: Present Perfect Continuous
- Second blank: Present Perfect Simple
- Solutions:
- First blank: have been reading
- Second blank: haven't finished

Answer: I have been reading the book you gave me, but I haven't finished it yet.

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#### 3. “Sorry, I’m late!” – “That’s all right. I __________ (not wait) long.”
- Analysis: The action of waiting is an ongoing action that started in the past and is still happening at the time of speaking.
- Tense: Present Perfect Continuous
- Solution: haven’t been waiting

Answer: “Sorry, I’m late!” – “That’s all right. I haven’t been waiting long.”

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#### 4. I __________ (clean) the windows. So far I __________ (clean) five of them. There are only two more to do.
- First Blank: The action of cleaning the windows is an ongoing activity that started in the past and is still happening.
- Second Blank: The action of cleaning five windows is a completed action up to the present.
- Tenses:
- First blank: Present Perfect Continuous
- Second blank: Present Perfect Simple
- Solutions:
- First blank: have been cleaning
- Second blank: have cleaned

Answer: I have been cleaning the windows. So far I have cleaned five of them. There are only two more to do.

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#### 5. There’s a strange smell in here. __________ (you / cook) something?
- Analysis: The action of cooking is likely ongoing because the smell is still present, indicating that the cooking might still be happening.
- Tense: Present Perfect Continuous
- Solution: Are you cooking

Answer: There’s a strange smell in here. Are you cooking something?

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Final Answers:

1. I have lost my key. Can you help me look for it?
2. I have been reading the book you gave me, but I haven't finished it yet.
3. “Sorry, I’m late!” – “That’s all right. I haven’t been waiting long.”
4. I have been cleaning the windows. So far I have cleaned five of them. There are only two more to do.
5. There’s a strange smell in here. Are you cooking something?

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Boxed Final Answer:
\[
\boxed{
1. \text{have lost} \\
2. \text{have been reading}, \text{haven't finished} \\
3. \text{haven't been waiting} \\
4. \text{have been cleaning}, \text{have cleaned} \\
5. \text{Are you cooking}
}
\]