How to form 'Subject' in a sentence explained in Tamil lesson 19.

The subject of a sentence is the person, place, thing, or idea that is doing or being something. You can find the subject of a sentence if you can find the verb. Ask the question, "Who or what" and the answer to that question is the subject. For instance, in the sentence "The computers in the Learning Center must be replaced," the verb is "must be replaced." What must be replaced? The computers. So the subject is "computers." A simple subject is the subject of a sentence stripped of modifiers.
Sometimes, though, a simple subject can be more than one word, even an entire clause. In the following sentence —
What he had already forgotten about computer repair could fill whole volumes

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