Wanna know what the dead give-away when reading articles written by people where English is their 2nd language?
They often don’t punctuate correctly and put a space BEFORE the period.
Example: My cat fluffy is a nice cat .
This is what it should be: My cat fluffy is a nice cat.
If English is a second language to you, please keep your punctuation tight to the end of each sentence and the commas are tight to the word they are separating.