What type of sentence is a telling sentences?

"Telling sentences" is not a standard grammatical term. It's possible it's a specific term used within a particular context, like a writing workshop or a specific writing style guide.

However, if you're asking about sentences that directly tell the reader something, it's likely you're referring to declarative sentences.

Here's why:

* Declarative sentences are the most common type of sentence. They make a statement or express an opinion. They typically end with a period.

* Examples of declarative sentences:

* The sky is blue.

* I am happy.

* She went to the store.

If you can provide more context about where you encountered the term "telling sentences", I can give you a more precise answer!