English Grammar - Inversion: "Had I known...", "Should you need..."

TRANSCRIPT Now, the thing to understand about inversions is that they are very particular. There are only a few expressions that you&going to use inversion with. You can&put them in just about... In just any sentence that you want. The examples that I&written on the board are the ones that you might read or that you might want to write. There are other situations that use this, but unless you&writing poetry or artistic, creative novels - you don&need them and you don&really need to worry about them either. They&very rare. It&very rare you&see them. It&very, very formal language style. And you&recognize them, hopefully, when you do see them. So let&start here. When we have "not only". Generally speaking, when we have a sentence that begins with a negative, we&going to have inversion, but especially when you have "not only", you&going to have inversion. Okay? "Not only did he", so there&your verb, there&your subject, there&your verb. Okay? We have the helping verb, the auxiliary verb to start. "Not only did he win", and then we have the "but", "also" to go with "not only". This is like an expression that&fixed; you&always going to be looking at the same thing. "Not only did he win, but he also broke the record." Whatever. "Not only", inversion, "but also". "Under no circumstances", this is another expression that you&see regularly. And again, we&looking at the negative construction which is why we&looking at the inversion. "Under no circumstances should you call her/call...