Thanks @emsr2d2 , I noted your corrections however I have queries about two of the corrections made.
1. You removed "then" after if, I know it's not necessary to use "then" after "if" but is it incorrect to use it at all?
2. Can't I use "Please confirm" before a question, as I did?
I'm confused about the usage of word "early" or "right away" in the below context, which is the right sentence?
"If I don't open the door early then wait for 5 minutes."
"If I don't open the door right away then wait for 5 minutes."
Which of the following statement is correct? I often have a hard time with prepositions.
I have two laptops, one I carry in office while the other remains at home.
I have two laptops, one I carry to office while the other remains at home.