Computer viruses can invade your system without you noticing, disrupting its operation and even stealing your data. To protect your device, it's important to know how to recognize signs of infection, ...
Possibly, "I do know that" can in fact only be used, when, you are answering the question of whether or not you know the issue at hand (or your knowledge has been called in to question, and you are answering that challenge). Let's say "out of the blue" you wanted to state that "you know that" -- and you wanted an emphatic version.
The string I don't know that is grammatical and common and is used to express doubt. The use of subordinators if or whether after know would suggest a less firm position: he doesn't know or he's not so certain. I don't know that there are bargains yet, but there certainly are opportunities. I don't know that the President has said that he fully supports the conference of the states I don't ...
Examples: I know (about) this difficulty/problem. I know (about) Engineering. In the first sentence, it seems to me that "to know" expresses that the speaker experienced the problem/difficulty before while "to know about" only expresses that the speaker has heard or read about it.
TechAnnouncer: Stay Protected: Understanding the Latest Computer Viruses and Threats in 2026
In 2026, viruses are getting smarter. Instead of just being files, some can hide in your computer’s memory without leaving a trace. Others use Artificial Intelligence (AI) to create trickier fake ...
TechAnnouncer: Stay Ahead of Threats: The Latest Computer Viruses and How to Protect Yourself