Many people write perfectly grammatical sentences that aren’t very good. Unnecessary words, modifiers out of place, that sort of thing. Here’s a (ahem) good example. Look at the item about the pencil:
Believe it or Not has long been a favorite of mine, and I don’t often find solecisms in it. This sentence has two!
Here’s the sentence:
The metal sleeve on a pencil, which holds the eraser, is called the ferrule
- First, the comma before “which” is correct. But the remark is not an aside! They should have written “the metal sleeve on a pencil that holds the eraser…”
- Also, they got things in the wrong order. The pencil engineering is more accurate if you say “The metal sleeve that holds the eraser on a pencil…”
Smoother, now, isn’t it?