Hi everybody. I can ask you a few questions about the text is below. <br/><br/>"Since my sister is not in the habit of working regularly it came us no surprise to me that she didn't manage to finish her term paper" <br/><br/>1- why "since" is used with present tense? what does it mean? <br/><br/>2- why past tense is after present tense with since? <br/><br/>since confuses me here.