Coordinating Conjunctions Worksheet (Key) for grammar practice.

Problem Overview:

The task involves completing sentences using the correct coordinating conjunctions from the provided list: and, but, so, or, because. Coordinating conjunctions are used to connect words, phrases, or clauses that are grammatically equal.

Solution and Explanation:

#### 1. The washing machine wouldn't spin, so I called the mechanic.
- Explanation: The second part of the sentence explains the reason for calling the mechanic. "So" is used to show a cause-and-effect relationship.

#### 2. I needed a blue pen, so I asked my friend.
- Explanation: Similar to the first sentence, "so" connects the need for a blue pen with the action of asking a friend, indicating a logical sequence.

#### 3. The necklace was expensive, because it was having lots of diamonds in it.
- Explanation: "Because" is used to explain the reason why the necklace was expensive. It provides a justification for the cost.

#### 4. It's raining heavily today, but tomorrow should be a better day.
- Explanation: "But" is used to contrast the current weather (raining) with the expected weather (better tomorrow). It shows a change or exception.

#### 5. I went to school by bus today, because the car did not start.
- Explanation: "Because" explains the reason for choosing the bus over the car. It provides a justification for the mode of transportation.

#### 6. I was expecting rain today, so I came with an umbrella.
- Explanation: "So" indicates a cause-and-effect relationship. Expecting rain led to bringing an umbrella.

#### 7. He was suffering from flu, so he did not attend the school.
- Explanation: "So" connects the illness (flu) with the action of not attending school, showing a logical consequence.

#### 8. They are always late to my class, but I don't really mind.
- Explanation: "But" contrasts their behavior (being late) with your attitude (not minding). It shows a difference or exception.

#### 9. Your project is looking safe and smart in the expo.
- Explanation: "And" is used to join two positive adjectives ("safe" and "smart") describing the project. It shows addition or combination.

#### 10. The shop closes on Tuesdays, but opens on Sundays.
- Explanation: "But" contrasts the closing day (Tuesdays) with the opening day (Sundays). It highlights a difference in the schedule.

Final Answer:

1. so
2. so
3. because
4. but
5. because
6. so
7. so
8. but
9. and
10. but

Boxed Final Answer:
\[
\boxed{\text{so, so, because, but, because, so, so, but, and, but}}
\]