The teacher had an interesting question today.
As a question, it can be a sentence, like: A sentence can have one word, and as a question then it can be a sentence: Who?
The sentence with the word 'why': Why do you ask this question?
The word 'is' can begin a sentence but not be a question when it is the subject of the question. Example sentence - Is can be the subject in a sentence. But only in sentences of that type (above) or, 'Is' is a two letter word. Otherwise is cannot begin a sentence.
"Is" is the second word of the question, "What is the second word of this sentence?"
A "sentence" in grammar is a group of words that expresses a complete thought. Most sentences consist of at least a subject (noun form) and a predicate (verb form). The word "sentence" can also mean the punishment given for a criminal offense. Specifically, a sentence may include incarceration, or fines, or both, and may contain a period of supervised probation.
Word, is the fifth word in this question.
the question you just wrote was a sentence with the word kinetic in it.
Your question is itself a sentence which uses the word "could".
no it can be a question but not a sentence
This is the answer to your question.
the question has a sentence with relative in it.
your question is itself a sentence