"Don't forget to bring a pencil" is the correct way to say "不要忘带铅笔" in Engpsh.

The phrase "don't forget" is used to remind someone to do something or to remember to bring something. "To bring" means to carry or transport something with you. "A pencil" is a writing instrument that is used for drawing or writing.

Here are some examples of this phrase in use:

"Don't forget to bring a pencil to class tomorrow." (不要忘记明天带一支铅笔去上课。)
"Make sure you don't forget to bring a pencil to the exam." (确保你不要忘记带一支铅笔参加考试。)
"I always forget to bring a pencil when I go to meetings. Can you remind me?" (我总是忘记带铅笔参加会议。你能提醒我吗？)