Dear Teachers,<br/><br/>1. A: Tonight you're covering for Doctor Steven?<br/><br/> B: Yep!<br/><br/>- "cover" here means "do someone's duty", right? and it also means "Teach for his or her class", right? because he or she can't go to school, right?<br/><br/>2. How do you come to school?<br/><br/>- By tube / underground / subway. Are "tube", "underground", "subway" are the same meaning?<br/><br/>3.Come on! my baby. Don't angry me anymore. I have known my faults.<br/><br/>- Is this natural?<br/><br/>Thanks very much to Teachers,<br/><br/> Stevenukd.