student asking question

Why are 'on' and 'in' positioned next to each other? Is it because it comes before 'course'?

teacher

Native speaker’s answer

Rebecca

"Dropped in" is a phrase that refers to visiting a place unexpectedly or casually, then "on" is used as a preposition that is linked to the noun "course". Two prepositions, like "in" and "on" here, can be next to each other in a sentence. Here, and in most cases, prepositions are next to each other in a sentence because they build on each other's meanings. Examples of sentences with two prepositions next to each other: Ex: The store was out of coffee, so I bought tea instead. (The prepositions "out" and "of" are next to each other) Ex: The toy is up on the shelf. (The prepositions "up" and "on" are next to each other)

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