An adverbial clause modifier is a clause which modifies a verb or other predicate (adjective, etc.), as a modifier not as a core complement. This includes things such as a temporal clause, consequence, conditional clause, purpose clause, etc. The dependent must be clausal (or else it is an advmod) and the dependent is the main predicate of the clause.
Ahmad kelgach quvondi \n He/she became happy when Ahmad arrived
advcl (quvondi, kelgach)
O’qib turib uxlab qolibman \n I fell asleep while reading
advcl (uxlab qolibman, o’qib turib)
Kitobni o’qisang,tushunarding \n You would understand if you had read the book
advcl (tushunarding, o’qisang)
Bu kitobni sen ham o’qirsan deb oldim \n I bought this book so that you would read it too
advcl (oldim, o’qirsan)
Bu kitobni oldimki, sen ham o’qiysan \n I bought this book so that you would read it too
advcl (o’qiysan, oldimki)
Bu kitobni o’qidingmi, hamma narsani tushunasan \n You will understand everything once you have read this book
advcl (tushunasan, o’qidingmi)