when we have to use since &for
with perfect continuous tenses :)
To use since/ for
I have been study English since 2010 (Since - To specify the year, month, day, hour ...)
I have been study English for 3 years ( For - To specify how long you are doing this)
I hope you understand
you can refer to the post below:
I need some english lessons
Wegen viel Arbeit oder wegen vieler Arbeit?
English speaking practice
The difference between "has + been + p.p" and "had + been + p.p"
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