To cover a bed with a blanket in English, you would say "cover the bed with a blanket". This phrasing comes from the way in which the verb "cover" is commonly used in English to describe the act of placing something over something else in order to protect or conceal it.

Here are some examples of sentences in which "cover" is used in this way:

"Can you cover the soup and put it in the fridge for me?"

"She covered her face with her hands to hide her tears."

"He used a tarp to cover the motorcycle and protect it from the rain."

翻译为：

"你能把汤盖上并放进冰箱吗？"

"她用手捂住脸，掩饰她的眼泪。"

"他用防水布盖住摩托车，以防雨水。"