Can someone write me a short story of two girls in the city pleas

Which verb from is used to indicate the perfect progressive tense

When aquinas realized that he could not find all the answers, he turned to

Why is it important to include a descriptive subject heading? it in sorting the topics. it the recipient see its importance. e-mail programs won’t allow e-mail to be sent without it. it keeps junk e-mail separate from important e-mail.