Using regular and irregular verbs
6a. I lay my book on the table, but now I cannot find it.
6b. I laid my book on the table, but now I cannot find it.
my answer is: 6a
Ahh -- this one caught you as it would most people.
You need the past tense of LAY in this sentence. The past tense is LAID, so b is correct.
This site has a good explanation of the parts of LIE and LAY and their meanings.
http://web.ku.edu/~edit/lie.html
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In this case, your answer is incorrect. The correct option is 6b, "I laid my book on the table, but now I cannot find it." Here's an explanation of why:
The verb "lay" is an example of an irregular verb in English. It means to put or place something down. The past tense of "lay" is "laid." So, when you are referring to an action that happened in the past, you use "laid" instead of "lay."
In sentence 6b, the speaker is referring to an action that happened in the past when they put their book on the table. Therefore, the correct form is "laid," making option 6b the correct choice.
On the other hand, option 6a using "lay" would be incorrect because it is the present tense form, which does not match the context of the sentence.