6.Loose and Periodic Sentences Loose sentence:a sentence in which the essential elements,in the main clause. come first,followed by subordinate parts, modifiers,etc.,as in a compound sentence. Periodic sentence:a sentence in which the essential elements,in the main clause,are withheld until the end or separated as by modifiers or subordinate clauses6. Loose and Periodic Sentences Loose sentence: a sentence in which the essential elements, in the main clause, come first, followed by subordinate parts, modifiers, etc., as in a compound sentence. Periodic sentence: a sentence in which the essential elements, in the main clause, are withheld until the end or separated as by modifiers or subordinate clauses