"Please fill out this form" is a common way to ask someone to complete a form in Engpsh.

The phrase "fill out" means to write or provide the required information on a form or document. It is a phrasal verb that is commonly used in Engpsh to describe the process of completing a form.

Here are some examples of the phrase "fill out" in use:

"Please fill out the registration form and bring it with you to the meeting." (请填写注册表格,并带着它来参加会议。)
"I need to fill out this apppcation 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 fill out this survey and return it to me by the end of the week?" (你能填写这份调查问卷并在本周末前返还给我吗?)