In some websites, there are sticky ads with slogans like these:
- Close the door tight and start playing this game!
- Make sure no one knows you are playing this game!
The second sentence sounds kind of weird to me. Why doesn't it say,
- Make sure no one will know you are playing this game!
After all, if someone knows you are playing this game, that's because you didn't close the door tight- you didn't make sure/haven't made sure ****. The idea here is that the current situation depends on the past. You can't control what happens now, you can only control what will happen.
Does Sentence 2 sounds weird to a native speaker too? Is Sentence 3 better than Sentence 2? If both are weird, how should the ad rephrase the sentence?