What this sentence mean: I didn't notice

Is the tense of the if second conditional past simple? EX: 1. If I studied hard, I would pass the exam.

English students try this!

I have a specific need for learning English. ①understanding hannah Gadsby standup comedy On Spotify there’s a show called woof by Hannah Gasby. I’d like to listen it through and understand the contents with Australian slangs and the jokes. I’d like my teacher to write the sentences I don’t understand. ②correcting my English blogs about the small businesses in Australia I’m currently in Australia, and writing the articles about the stores I like. I’d like y teacher to correct my English. I’m not willing to take lessons by American teachers but British or Australian teachers. If anyone can help these needs, please contact me! I’m struggling to find the best teachers. If you like Hannah Gadsby, you’re the perfect one for me…!!!

It’s been a long time back to Italki.

Choose the correct preposition.

Choose the correct answer.

What does “on”mean on this picture ？

Hello native English speakers. Question about two sentences with the same meaning as I try to rewrite. 1. With change happening so fast, the argument went, why be prepared when nobody knew what to be prepared for.（original） = (my guess) 2. With change happening so fast, the argument went ，when nobody knew what to be prepared for why (it should) be prepared. = 3. With change happening so fast, the argument went , for example, on why (it should) be prepared when nobody knew what to be prepared for. Question: Which is grammatically correct? Do they have the same meaning?