Grammar fix
main idea
most important idea
The most important point or message in a piece of writing, speech, or conversation.
collocationB1common
Hear it in context
Notice where the phrase sounds natural.
The main idea of the article is that exercise is important for good health.
In my opinion, the main idea of the lecture was that technology can improve education if used correctly.
Fix the pattern
One small grammar move makes it sound right.
Not: The main idea is talking about pollution.
Say: The main idea is pollution. / The text is about pollution.
An idea doesn't 'talk' — say 'the main idea is X' or 'the text is about X'.
Which sounds natural?
Tap the one a native speaker would say.
'The main idea' is natural; 'central conceptual thrust' is academic.
Build natural chunks
Words that usually travel with it.
the main idea (of)
- of
- get the
- is
- behind