Lie means to recline and will not have a direct object. The past tense is lay. Before you fall asleep, you should lie down. I lay awake for three hours yesterday. Let's go to the library after lunch.
Lets means allows.
My sister lets me use her book . When your shirt is not tucked in, it hangs loose. Lose means to cease or stop having. We passed your house on the way to school. Past means earlier than the present time.