Is Andy here? – I don’t know, I … (not see) him today. Where … you … (go)? – To the library. Would you...

Is Andy here? – I don’t know, I haven’t seen him today.

Where did you go? – To the library.

Would you like to borrow this magazine? – No, thanks. I have read it before.

Betty’s bus is arriving at 5 o’clock. I must go and meet her at the bus station.

Have you seen my record book? I have been looking for it all morning.

Mike has been talking to his friend for an hour already.

More and more forests are disappearing because of fires nowadays.

How long have you been working on this problem?

The first lesson doesn't finish at 9.45.

They are playing football tonight.

Linda is disappointed. She has failed her test.

School prepares children for life.

We are having a party next Saturday night. Will you come?

Are you trying to take photos? It’s not allowed, you know.

Do you remember where he worked?

Certainly! Let's complete the sentences and explain the grammar involved:

1. Is Andy here? – I don’t know, I … (not see) him today.

   • I haven't seen him today.
   • Explanation: This sentence uses the present perfect tense ("haven't seen") to indicate that up to the present moment, the speaker has not seen Andy.

2. Where … you … (go)? – To the library.

   • Where are you going?
   • Explanation: The present continuous tense ("are you going") is used for actions happening now or plans for the near future.

3. Would you like … (borrow) this magazine? – No, thanks. I … (read) it before.

   • Would you like to borrow this magazine? – No, thanks. I have read it before.
   • Explanation: "To borrow" is the infinitive form after "would like." The present perfect tense ("have read") indicates a completed action with relevance to the present.

4. Betty’s bus … (arrive) at 5 o’clock. I must go and meet her at the bus station.

   • Betty’s bus arrives at 5 o’clock.
   • Explanation: The simple present tense ("arrives") is used for scheduled events, like public transportation timetables.

5. Have you seen my record book? I … (look) for it all the morning.

   • I have been looking for it all morning.
   • Explanation: The present perfect continuous tense ("have been looking") emphasizes the duration of the ongoing action.

6. Mike … (talk) to his friend for an hour already.

   • Mike has been talking to his friend for an hour already.
   • Explanation: The present perfect continuous tense ("has been talking") indicates the action started in the past and is still continuing.

7. More and more forests … (disappear) because of fires nowadays.

   • More and more forests are disappearing because of fires nowadays.
   • Explanation: The present continuous tense ("are disappearing") is used to show a trend or a change happening over time.

8. How long … you … (work) on this problem?

   • How long have you been working on this problem?
   • Explanation: The present perfect continuous tense ("have been working") is used to ask about the duration of an action that started in the past and continues to the present.

9. The first lesson … (not finish) at 9.45.

   • The first lesson does not finish at 9.45.
   • Explanation: The simple present tense ("does not finish") is used for habitual actions or scheduled events.

10. They … (play) football tonight.

    • They are playing football tonight.
    • Explanation: The present continuous tense ("are playing") is used for planned future events.

11. Linda is disappointed. She … (fail) her test.

    • Linda is disappointed. She has failed her test.
    • Explanation: The present perfect tense ("has failed") indicates a past action with present relevance.

12. School … (prepare) children for life.

    • School prepares children for life.
    • Explanation: The simple present tense ("prepares") is used for general truths or facts.

13. We … (have) a party next Saturday night. Will you come?

    • We are having a party next Saturday night.
    • Explanation: The present continuous tense ("are having") is used for planned future events.

14. … you … (try) to take photos? It’s not allowed, you know.

    • Are you trying to take photos?
    • Explanation: The present continuous tense ("are you trying") is used for actions happening right now.

15. … you … (remember) where he … (work)?

    • Do you remember where he works?
    • Explanation: The simple present tense ("do you remember" and "works") is used for mental states and general facts.