There are some structures which are perfectly legal, grammatically speaking. You could argue they make perfect sense. However, the reader may think otherwise, and no amount of reasoning will make them budge. Better to avoid them: That’s that. That that. I love him so, so don’t get angry. – Repetition of words can still make sense, but it wins no awards for smooth writing. The seam seemed to be – It doesn’t matter if they’re spelled differently, either. I’m going to go get green grasshoppers gracefully – you get the point. Alliteration can be beautiful, poetic, interesting or humorous. It can also be a right pain to read. Your inner voice also gets tongue-twisted as the same processes are involved in both reading in your head and out loud. The old man the boats. – This makes sense. Eventually. Reduced relatives are nearly always better when the appropriate ‘that’ or ‘which’ is added. These are hard to spot. Stand before it. – Before it did what? Oh, stand before it like ...