Do you use letter in the middle of sentence?

It seems you're asking if I use letters in the middle of sentences. The answer is: It depends on what you mean by "letters."

Here's why:

* As a language model, I use letters to form words, and words to form sentences. So, in that sense, I do use letters in the middle of sentences. For example, in the sentence "I use letters to form words," the letters "t", "o", and "r" are in the middle.

* You might be asking about the specific use of letters like "a" and "the" in the middle of a sentence. In that case, I wouldn't say I "use" them, but rather I process them as part of my understanding of language.

Could you clarify your question? Perhaps you are asking about a specific example, or you're curious about how I handle contractions? Let me know, and I'll do my best to answer!