I'm new here.
I am still confused whether I could use comma at certain place in a sentence after looking for several online articles.
I wonder maybe my question is too basic to find specific rules, hopefully I will have some help from you.
- The sentence below is from an online article: I wonder why it is natural to not use comma befor "there have been ~~~shortages."
1.1) For well over two decades there have been warnings of a looming crisis in the health-care system due to the ageing population and significant workplace shortages.
1.2) For well over two decades, there have been warnings of a looming crisis in the health-care system due to the ageing population and significant workplace shortages.
- This is from Stuart Little: Similar question. Why is there no need to plus a comma after "Before he was many days old"
2.1)
2.2) Before he was many days old, he was not only like a mouse ~~~.