Please help for making correction

Mmm... let's see:

"after 3 days of vacation..."
or
"after a 3-day vacation..."

"... today is the first day I'm back to work"
or
"... today is my first day back to work"

Hope this helps!

Paul,
Many thanks for your correction.

Would you please make another correction for me?
"Some of the kids couldn't find out the verb from the sentences. They have difficulties to add "es" or "s" at the end of verb when the subject is "He" or"She" or "name".

Thanks for your help!

"Some of the kids couldn't find/identify the verbs in the sentences." The phrasal verb "find out" implies "to gain knowledge" or "to go and find; to search".

I think the proper expression is "they have difficulties in adding 'es' or 's' at the end of verbs when the subject is 'he', 'she' or a name".

Hope this helps!

Many thanks for your reply. Would you please help with this sentence,
"I believe that you will find peace when you thinking in positive way"

Hello Charis,

I believe that you will find peace when you think in a positive way.

or

I believe that you will find peace when you think in positive ways.

or

I believe that you will find peace when you think positively.

or

I believe that you will find peace when you think optimistically.