Write each sentence in the " If ................ Then " form.
A set with no elements is called the empty. Set.

Answer

To rewrite the sentence "A set with no elements is called the empty set" in the "If... Then..." form, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Condition**: The first part of the sentence describes a condition. Here, the condition is "a set with no elements".

2. **Identify the Conclusion**: The second part of the sentence describes the conclusion that follows from the condition. In this case, the conclusion is "is called the empty set".

3. **Construct the If... Then... Statement**:
- Start with the condition identified in step 1 and place it after "If".
- Then, take the conclusion identified in step 2 and place it after "Then".

Putting it all together, we can write:
- **If a set has no elements, then it is called the empty set.**

### Final Statement:
If a set has no elements, then it is called the empty set.

---