在英语中，“你在填表吗？”可以用以下几种方式表达：

Are you filpng out a form?
Are you completing a form?
Are you working on a form?

这些表达方式来源于英语中“fill out”，“complete”和“work on”这些动词的常见用法。例如：

I need to fill out this apppcation form before I can apply for the job. (我需要填写这份申请表才能申请这份工作。)
Can you help me complete this survey form? (你能帮我填完这份调查表吗？)
I'm working on a form for my taxes. (我正在填写我的税表。)