I just figured out a problem in my grammer, although im quite native it seems strange to me that i havn't ever thought about previously!!
Consider these two statements, which one is correct and why?
"...there is some drugs/books/pencils/documents" versus "...there are some drugs/...."
And how about IT and THEY
"it is my documents/books/.." versus "They are my documents/books/..."
Intuitively, I used to say "there are" and "They" respectively. But, I think both cases are correct at least in spoken language.