他在干什么用英语怎么说说

"What is he doing?" is a common English question asking about someone's current activity.
Source: The question "What is he doing?" is a basic English inquiry that has been in use for a long time.
Examples:
"What is he doing?"
Translation: 他在干什么？
"Can you tell me what he's doing?"
Translation: 你能告诉我他在干什么吗？
"I wonder what he's up to."
Translation: 我想知道他在干什么。