contact is a noun and not a verb. You can have it, or make it or get in it, but you can’t do it. To say contact Jerry and ask him about this, you could say make contact with Jerry and ask him about this, but you might as well say ask Jerry about this. It’s more of a warning than a problem in itself.

at this time is an insulator. We have tenses in the language automatically, so if you say it is warm, the word is already tells you when the warmness happens: now. If you have to emphasize that you’re talking about now, say now.

Just a reminder that you’re due for a dentist appointment (instead of remember, you’re due for a dentist appointment) says if you look in a certain place you’ll find something that tells you something, and that place is right here instead of just saying the something. This is just to say that— is like introducing yourself as I am this person named—, and I’ll have to ask you to take that off says eventually I will be required to tell you something, and that something is to take that off instead of just please take that off.

Multiple uncertainty is another kind of insulation: I might want to do something like that can be valid, but usually a single well-placed hedge is enough for a whole sentence.

loading slips an assumption into a conclusion. It’s like an annoying flashback in a novel, or dropping a name: you loose track of the point. The canonical example is When did you stop beating your wife? — I never started isn’t a direct answer, so it looks evasive.

More explicit loading often looks like since x, y in a conversation where y is the important thing [x theme, y rheme]: x hides behind it (a shingle problem), which is the main part of the sentence: since you're a mean-spirited ogre, I'll get you a big drink. I should either leave the ogre part out (if you already know it) or say I think you're a mean spirited ogre, so I'll get you a big drink (if I'm telling you something new). If something is common knowledge, don't mention it; if it's new, introduce it properly and give people a chance to consider it. Since is often a sign that someone is trying to make an opinion look like a fact.

meiosis is understatement meant to overstate — that's a rather large dog, or I'm a little curious about that.

shingle problems happen when you want people to see the newest thing, but they have to see things in order: you have to ratchet back little by little. For instance, most blogs start with the newest post, but that post will end with the newest sentence. As you read down the page, you go from the almost-newest thing to the newest thing to the almost-second-newest thing to the second-newest thing — like shingles, stacked up but facing down.