Answer:
Reading and listening involve receiving information and so they are called the receptive skills. Speaking and writing are known as the productive skills because they involve producing words, phrases, sentences and paragraphs.
Explanation:
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A sentence refers to the pair of words which is complete in itself. In other words, a sentence contains a subject and a predicate or it may contain a main clause and one or more subordinate clauses to convey a command, exclamation, question or statement.
<em>
Subject</em> refers to the thing or person that is being talked about or described.
Therefore, word which represents the subject in the sentence is 'I', who is the doer of the action.
