I am going to post my letter later.
Later, I will eat a sandwich.
give a sentence using the word 'to check out'
I can't imagine using it at the start of a sentence. I'd move it to later in the sentence.
One sentence using all the letters in "these letters" could be: "Settle these letters on the shelf for later use."
the atheist later became a scientist :)
Let's get together for coffee later.
You are scheduled to take an aptitude test later today.
I need an acceptance letter.
Tell me who wrote the letter!
Yes.
i shall decide wether or not to go to the shrine later.
Later on we'll turn off the phone and light the fireplace.He brought the shrubs on the first trip, later on he came back with the equipment to plant them.