In my discussion of prepositions on YouTube, I’ve given a lot of attention to the choice of prepositions. Very often learners question whether we are surprised by something or at something. They ask if we can be happy about or with something.
Another point of confusion is the placement of a preposition or a prepositional phrase within a sentence. Students may not be familiar with the term stranded preposition, but they probably have asked questions like Who are you talking about? or voiced complaints such as I have no one to talk with. It might be helpful to tell them these structures are completely acceptable in everyday English and follow up with practice.
Please consider my Placement of Prepositions_handout. It invites upper level students to examine the position of prepositions and consider when it’s okay to separate a preposition from its object. There’s the extra challenge of identifying these small function words in context and deciding where a whole prepositional phrase is best placed.
Source on stranded prepositions:
Greenbaum S. and Quirk R. (1995). A student’s grammar of the English language. Essex: Longman Group UK Limited.