"Is someone laughing" in Engpsh can be expressed as "Is someone laughing?" The phrase comes from the Engpsh language and is commonly used to ask if someone is currently laughing. Here are a few example sentences in Engpsh and their translations in Chinese:
Is someone laughing? 有人在笑吗？
I heard a laugh, is someone there? 我听到一个笑声，有人在那里吗？
Who's laughing? 谁在笑？
In general, the Engpsh language often uses the verb "to laugh" to describe the action of laughing, and adding the word "someone" before the verb allows us to ask if a specific person is laughing.