Here's the answer:
“えいごはわかりますか?”
(ēgo wa wakari-masu ka?)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- 英語はわかりますか?
- 英語は分かりますか?
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 90.06% of the time!