Is this sentence correct? "I remember when we lay in the grass."
Congrats to 36% of you. This sentence is in the past tense. To see what's what, let's put it in present tense:
"I lie in the grass."
What's the past tense of the verb "to lie"?
Yesterday, I lay in the grass.
What's the past participle of "to lie"?
I have lain in the grass for two minutes.
What's the progressive form of "to lie"?
I have been lying in the grass since yesterday.
Now let's confuse ourselves by looking at the verb "to lay," which you use with an object, such as "I want to lay the blanket on the bed."
Present tense: He lays the blanket on the bed.
Past tense: He laid the blanket on the bed.
Past participle: He has laid the blanket on the bed.
Progressive form: He is laying the blanket on the bed.