Re: Paragraph Correction
I too welcome you to the forums.
The writing and editing area is a bit of a problem for us. We can't help people with school work (at any education leve), because it's important that your teachers see what you can do on your own. Once you write your assignment and hand it in, if you get responses from your teacher that you don't understand, you can ask us.
Having said that, I see problems in your use of the indefinite article. Look at your first sentence again.
And although I can't rewrite this for you, I can tell you that this part doesn't make sense: Although its principle looks much old and simple for huge aircraft,
You need to think about that.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.