sometimes/ sometime/ some times/ some time

[white.rose]

1- What are the differences between these adverbs?

2- Is it corect to say "I've been sometimes before." I tried to search the sentence on google enclosing it in quotation marks but no result.

 

[Rover_KE]

1. Click here to see lots of examples of how these words/phrases are used in context. (When the red pop-up appears, click on the blue box on the right to remove it..)

2. Your sentence is not idiomatic. Find a better example.

(Everybody should bookmark the Fraze.It site for future reference.

 

[white.rose]

1. Click here to see lots of examples of how these words/phrases are used in context. (When the red pop-up appears, click on the blue box on the right to remove it..)

2. Your sentence is not idiomatic. Find a better example.

(Everybody should bookmark the Fraze.It site for future reference.

Regarding the second sentence, why adverbs like "many times" and "few times" work fine after "I've been" but not "sometimes"?

I've been many times before.
I've been a few times before.

If someone asks "Is it your first time?", how to say sometimes? Is there another word for the same meaning?