Can this sentence have a exclamation mark at the end The clown juggled with three balls?

No, the sentence "The clown juggled with three balls" does not require an exclamation mark at the end. It is a simple statement of fact and does not express any strong emotion or surprise.

Here are some examples of when you might use an exclamation mark:

* Surprise or excitement: "Wow! That clown is amazing!"

* Strong emotion: "Help! I'm stuck!"

* Command or instruction: "Stop! Don't touch that!"

Since the sentence about the clown is simply stating a fact, it doesn't fit any of these categories.