LESSON 3 · Grammar That Actually Matters
Small Words, Big Confusion
You can handle complex vocabulary. You understand advanced grammar. But prepositions like "in," "on," "at," "by," "for," and "to" still trip you up every day. That is because small words in English carry enormous meaning.

The frustrating truth about prepositions is that they are not fully logical. You stand "in" a room but "on" a bus. You arrive "at" the airport but "in" the city. These patterns come from centuries of linguistic evolution, not from a rule book.