Adverb clauses are introduced by subordinating conjunctions : after,although,as,as if,as much as, as long as, as soon as, because, before, if, in order that,lest,since,so that, than,that,though,unless,until,wen,whenever,,where,wherever,whether,while. Essential parts of an adverb clause may properly be omitted if no misunderstanding will occur. Such as clause is called an elliptical clause. Note : An adverb phrase or clause that modifies a verb may be placed before or after the verb it modifies, but not between two verbs that it might modify. An adverb phrase or clause that modifies an adjective or an adverb is usually placed after the word it modifies. Place adverb modifiers as close as possible to the words they modify.