Here's something interesting. It's a little technical and a little obscure, but if you read it you'll learn something odd and interesting about the English language, and you never know when it might come in handy.
Let's look at those last two snippets side by side, highlighting all the prepositional phrases:
- I waved at Dorothy from the bus.
- It was entangled on the branch of a dead tree.
When set out like that, they look like they have the same structure, but we know that one is chained and the other is nested.
It's pretty confusing how two sentences that look like they have the same structure actually don't. And it gets weirder. Take a look at this sentence:
- The wizard listened to the child with the wand.
Is the wizard using the wand to listen to the child? That would be a chain:
- The wizard listened to the child with the wand.
Or is the child holding the wand? That would make the second prepositional phrase nested inside the first one:
- The wizard listened to the child with the wand.
From just that sentence, we have no idea. That's called ambiguity—the sentence can mean more than one thing. (And an editor might tell the writer of that sentence to change it so it's no longer ambiguous.)
Prepositional phrases are tricky like that. Sometimes you just have to think about what makes the most sense. And sometimes that will mean looking at more than just the sentence with the prepositional phrases in it!
If you read this section, high five! Have a muffin on me! (I don't mean on me, I mean... never mind.)