1. Did Matt play the guitar when his friends arrived? 2. It is cold, so should we wear our coats? 3. I wanted to invite

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1. Matt did not play the guitar when his friends arrived. To understand this, we need to look at the verb tense used in the sentence. The verb "did play" is past tense, indicating that the action has already happened in the past. Since the sentence states that his friends arrived at a certain time, we can conclude that Matt did not play the guitar at that specific time.

2. It is cold, so we should wear our coats. The word "so" indicates a cause and effect relationship. In this case, the cause is the cold weather and the effect is the action of wearing coats. The sentence suggests that because it is cold, it is appropriate and necessary to wear coats to keep warm.

3. Yesterday, I wanted to invite her to the cinema, but she wasn"t at home. This sentence describes a desire or intention to invite someone to the cinema in the past. However, the person was not at home at that time, which prevented the invitation from happening.

4. We can"t go to the beach because it is raining. The word "because" is used to provide a reason or explanation for why something cannot happen. In this case, the rain is the reason why the action of going to the beach is not possible.

5. It is very cloudy, and it is going to rain soon. The sentence states two facts: it is currently cloudy and rain is predicted to happen in the near future. The use of the phrase "going to" indicates a future event, suggesting that rain will occur soon.

6. Water boils at 100 degrees Celsius. This statement is a scientific fact. When water reaches its boiling point, which is 100 degrees Celsius at sea level, it turns into vapor or steam.

7. I have been working here since last year. This sentence uses the present perfect continuous tense to indicate an action that started in the past and is still ongoing. In this case, the action of working at the current place began last year and is continuing up until now.

8. She has had this laptop for six months. The sentence uses the present perfect tense to indicate an action that started in the past and has a result in the present. In this case, the action of owning the laptop started six months ago and is still relevant at the time of speaking.

9. While my girlfriend tries on dresses in the shop, I will be reading a book. This sentence describes two simultaneous actions happening in the future. The phrase "while my girlfriend tries on dresses" indicates that the action of trying on dresses will happen at the same time as the action of reading a book.

10. After I forgot to call my wife, she became very angry. This sentence describes a cause and effect relationship. The cause is forgetting to call the wife, and the effect is the wife becoming very angry. The word "after" indicates that the anger occurred as a result of the forgotten phone call.

11. You appear to be tired. This sentence is an observation or assessment of someone"s current state. The word "appear" suggests that the person looks or seems tired, but it does not provide a definite confirmation of their fatigue.