Answer: A group of words which has a subject and a predicate and gives clear and complete sense is called sentence.
Question: What are the components of sentence?
Answer: A sentence usually has a subject, (a modal auxiliary verb/a helping verb), a verb and an object/a complement.
Question: What is subject?
Answer: In sentence doer of action or the person, thing or place which we are talking about is called subject.
Example:
He is writing a letter.
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