She walked across the floor and lay down on the bed.

她走过地板躺在了床上。

《柯林斯英汉双解大词典》

He lay on the floor groaning.

他躺在地板上呻吟。

《牛津词典》

The book lay open on the table.

书摊开在桌子上。

《牛津词典》

So you would say in the past tense "I lay on the bed because I was tired."

VOA: special.2010.02.11

And so they lay. 1853. Let's get Angstrom up on the board here since he did the work.

因此在183年这些就存在了，让我们把阿姆斯特朗,写到黑板上来，鉴于他做的这个工作。

麻省理工公开课 - 固态化学导论课程节选

And I really don't want to just lay on the beach while everybody's having fun.

大家都会玩得很开心，我可不想到时一个人躺在沙滩上。

The thing is 实战 - SpeakingMax英语口语达人

Good as these chapters are, they make heavy demands on the lay reader.

ECONOMIST: Nobel prizes

The dust thickened as we neared the Trade Center buildings, and down on the ground lay people's resumes next to office supplies and photographs.

CNN: Day turns to night at ground zero

As insights go, this may seem obvious, but Mr. Coase would eventually receive the Nobel Prize, in 1991, for pointing out what wasn't actually obvious in the 1930s and for going on to lay the foundation for institutional economics.

WSJ: Book Review: The Org