NASB 1995
Philip ran up and heard him reading Isaiah the prophet, and said, "Do you understand what you are reading?"

American Standard Version
And Philip ran to him, and heard him reading Isaiah the prophet, and said, Understandest thou what thou readest?

Berean Study Bible
So Philip ran up and heard the man reading Isaiah the prophet. “Do you understand what you are reading?” Philip asked.

Douay-Rheims Bible
And Philip running thither, heard him reading the prophet Isaias. And he said: Thinkest thou that thou understandest what thou readest?

English Revised Version
And Philip ran to him, and heard him reading Isaiah the prophet, and said, Understandest thou what thou readest?

King James Bible
And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest?

World English Bible
Philip ran to him, and heard him reading Isaiah the prophet, and said, "Do you understand what you are reading?"

Young's Literal Translation
and Philip having run near, heard him reading the prophet Isaiah, and said, 'Dost thou then know what thou dost read?'

Acts 8:30 Additional Translations ...