The main idea is the one statement that every sentence in the passage supports. A detail supports it, but it does not cover the whole passage.
This lesson is part of reading and evidence in the SPM Bahasa Tamil guide. The next skill is telling a stated detail from an inference.
How do I find the main idea?
Ask what the passage is about, then ask what it says about that topic. Finally, check the statement against every sentence: if one sentence does not fit, the statement is too narrow or wrong.
A useful test is to cross out one detail. If your sentence still stands, it is probably the main idea. If it collapses, you picked a detail.
Worked example: a boy and a garden
Here is an original passage.
கணேசன் தினமும் காலை ஆறு மணிக்கு எழுந்து தன் தாத்தாவின் தோட்டத்தில் தண்ணீர் ஊற்றுவான். பள்ளி விடுமுறை நாட்களில் அவன் களைகளையும் பிடுங்குவான். கடந்த மாதம் தக்காளிச் செடிகளில் முதன்முறையாகக் காய்கள் காய்த்தன. அவன் அவற்றைப் பக்கத்து வீட்டாருக்கும் கொடுத்தான்.
In English: Ganesan wakes at six each morning and waters his grandfather’s garden. On school holidays he also pulls weeds.
Last month the tomato plants fruited for the first time, and he gave some to the neighbours.
Step 1: the topic. The topic is Ganesan and the garden.
Step 2: list the details. Watering at six, pulling weeds in holidays, tomatoes fruiting, sharing with neighbours.
Step 3: write a sentence that covers them all. கணேசன் தன் தாத்தாவின் தோட்டத்தை அக்கறையுடன் பராமரிக்கிறான். It means Ganesan looks after his grandfather’s garden with care.
Step 4: test it. Watering and weeding are care, the tomatoes are its result, and sharing follows from that result. Every detail fits.
The mistake that costs marks
The usual slip is picking the most interesting sentence. Here that is the last one: “He gave the tomatoes to the neighbours.”
| Candidate | Why it fails | Verdict |
|---|---|---|
| He gave tomatoes to the neighbours. | Covers one sentence only | Detail |
| He wakes at six. | Covers one sentence only | Detail |
| He looks after the garden with care. | Covers all four sentences | Main idea |
A second slip is writing a label, such as “தோட்டம்” (garden). A label names the topic but does not say anything about it.
Check yourself
Read this original passage and write the main idea in one sentence.
நூலகத்தில் புத்தகங்களை இரவல் வாங்க அட்டை வேண்டும். அட்டையை வைத்திருப்பவர்கள் இரண்டு வாரம் வரை புத்தகத்தை வைத்திருக்கலாம். காலம் தாண்டினால் தாமதக் கட்டணம் செலுத்த வேண்டும்.
Answer
The passage gives the rules for borrowing library books. A good Tamil sentence is: நூலகத்தில் புத்தகங்களை இரவல் வாங்குவதற்கான விதிகள் இவை.
The three details are the card, the two-week limit and the late fee, and each one is a rule. “Late fee” alone is a detail, so it would lose the mark.
What to study next
Move on to distinguishing a stated detail from an inference, then test yourself with the reading and evidence practice set.
If you would like a teacher to go through your own chosen sentences, see online one-to-one SPM Bahasa Tamil tuition.