Mr Green left the office half an hour ago
格林先生半小时以前就离开办公室了.
This exercise was too difficult for them to work out
对于他们来说这种练习很难做.
THe sports meet was put off because of the heavy rain
由于下大雨了,运动会被取消了.
Peter's parents interrupted him
皮特的父母打断了他的讲话.
She went to bed after she finished her drawing
她画完画后才睡觉.