Definition: In this task, you are given triplets. Each triplet is in the form of [subject, predicate, object]. Your task is to generate proper sentence that utilizes these triples. The objective is to construct a sentence that (a) captures the facts specified in the triples and (b) is a well-formed sentence easily understandable by a human. All triple values need not be used directly in the sentence as long as the facts are adequately captured.
Input: [['1', 'SERVICE_PATTERN', 'All stations'], ['1', 'DESTINATION', 'London Bridge'], ['1', 'FREQUENCY_(PER_HOUR)', '4'], ['1', 'OPERATOR', 'Southern'], ['1', 'LINE', 'Metro']]

When London Bridge is the destination, the frequency is 4.0.