Is the word laid past tense what is rule?

You're almost there! "Laid" is the past tense of the verb "to lay".

Here's the breakdown:

* Lay (present tense) - means to place something down.

* Laid (past tense) - means to place something down in the past.

* Lying (present participle) - means to be in a horizontal position.

* Lain (past participle) - means to have been in a horizontal position.

Rule: The past tense of "lay" is laid. The past participle is "lain".

Let me know if you have any other questions about past tenses!