These sentences are taken from COCA:<br/><br/><b><u>When</u></b> <b><u>I</u></b> <b><u>was</u></b> <b><u>young</u></b> I <b><u>had</u></b> wandered through on summer days.<br/><br/>They'd laughed at my name <b><u>when</u></b> <b><u>I</u></b> <b><u>was</u></b> <b><u>young</u></b>, and I <b><u>had</u></b>n't liked it much.<br/><br/>He <b><u>had</u></b> evidenced traces of it <b><u>when</u></b> <b><u>he</u></b> <b><u>was</u></b> <b><u>young</u></b>;<br/><br/>But I once learnt we better use the past perfect.<br/><br/>Is that true?<br/><br/>Could you share your views, teachers?<br/><br/>Thank you very much.