Table: german_f3_2008
Columns: team
driver
class
chassis
engine
rounds

Question: How many rounds did satrio hermanto go with an opc-challenge engine?
SQL: SELECT "rounds" FROM german_f3_2008 WHERE "engine" = 'opc-challenge' AND "driver" = 'satrio hermanto'

Question: How many rounds did frédéric vervisch go?
SQL: SELECT "rounds" FROM german_f3_2008 WHERE "driver" = 'frédéric vervisch'

Question: How many rounds did shirley van der lof go?
SQL: SELECT "rounds" FROM german_f3_2008 WHERE "driver" = 'shirley van der lof'

Question: What c class engine did philipp eng and team hs technik motorsport use?
SQL: SELECT "engine" FROM german_f3_2008 WHERE "class" = 'c' AND "team" = 'hs technik motorsport' AND "driver" = 'philipp eng'

Question: What is the chassis of rahel frey's volkswagen engine?
SQL: SELECT "chassis" FROM german_f3_2008 WHERE "engine" = 'volkswagen' AND "driver" = 'rahel frey'