Practice of "as soon as" and "in the meantime" and "as if"

I'll let you know as soon as possible.
He goes out again as soon as he gets home.
I buy new things as soon as I get paid.

I make a salad; in the meantime, I make soup.
The baby plays by herself; in the meantime, I write sentences on italki.
I watched the movie; in the meantime,I ate french fries. This is possible, but it would sound more natural as "I ate French fries while watching the movie."

Hurry up! It looks as if it's going to rain.
He's very smart.He looks as if he is a teacher.
He's very active as if he were/was a puppy. You can say, "as active as a puppy" or "he looks like a teacher." If you want to use "as if" you need as if + noun + verb.

You've done really well.

Please check above are correct or not. Thank you for your help:)
Have a good day!