Use a comma to separate the "wagging tail" from the rest of the sentence. ("Wagging Tail" is not an official grammatical term, but an informal one to describe the variety of "appendenges" at the ends of sentences. These may include phrases, parenthetical expressions, and occasionally dependent clauses.)

what is the sentence?

We can make up our own, I am stuck as how to write a sentence ans what they mean by wagging tails.

The boy was so happy it looked as if he was "wagging his tail."

thank you

To properly use a comma to separate the "wagging tail" from the rest of the sentence, you need to identify the specific element that constitutes the wagging tail. In this case, the wagging tail is described as an informal term to denote various elements at the end of a sentence. These elements can include phrases, parenthetical expressions, and dependent clauses.

To separate the wagging tail from the rest of the sentence using a comma, locate the point where the wagging tail begins. Typically, this will be after the main clause of the sentence. The main clause is the part of the sentence that contains the subject and the verb and expresses a complete thought.

Once you have identified the main clause, place a comma after it to separate it from the wagging tail. This will create a clear distinction between the core part of the sentence and the additional information or expressions that follow.

Here's an example to demonstrate the use of a comma to separate the wagging tail:

"The cat jumped onto the table, knocking over a vase in the process."

In this example, "The cat jumped onto the table" is the main clause, and "knocking over a vase in the process" is the wagging tail. The comma after "table" indicates where the wagging tail begins.

Remember, the use of a comma to separate the wagging tail is subjective and depends on the specific context and style of writing.