I haven't met her since the new student come to our school.
Tom failed the exam last week. Since then, he has been unhappy.
So far, he has sold 10 pairs of pants and bought 5 books.
They have been gone for two hours.
Up until the end of last month, there hadn't been any chicken in my fridge, because we didn't buy any.
It snowed last Wednesday. The world is so beautiful being white. Since then, there has been 12 big snowmen in the school.