The English verbs lay and lie are commonly confused by even native English speakers. I’m not lying when I say that you can now lay your fears of not knowing the difference to rest.
Lay is a transitive verb, which means that it must be used with a direct object. The past tense and the past participle of lay are both laid.
Lie is an intransitive verb, which means it cannot have a direct object. The past tense of lie is lay and the past participle is lain.
Lie (past tense lied) means to say something untrue.
The Bottom Line
There are two problems here. One is that lie and lay mean more or less the same thing; it’s just that lie is intransitive and lay is transitive. In addition, the past tense of lie is identical to the present tense lay. Just remember that in the present, you lie down/on/in, but you lay something. Once you’ve got that straight in your head, you just need to work on the past tenses and you’ll be all set – no lie!