You will learn the fourth usage of Present Perfect Tense in this video. Since we form sentences which depend upon usages, we must be perfect with all the usages of all the tenses at first. Then only, we can convey our thoughts perfectly. So, never be careless of knowing the definitions of every tense. Everything will be possible if it is done regularly, sincerely and punctually. Exercise sentences have been given in the link below. https://drive.google.com/file/d/1d51j... Practise them without fail. And the answer key for the last class has also been given in the link below. https://drive.google.com/file/d/1JdcE... Refer it to make your doubts clear.