Though knowing the truth, he remained silent．

Even though given every opportunity, they would not try．

Once completed, this power station supplies the nearby towns and villages with electricity．

According to the directions, when(it is)taken, the drug has no side effects．

While(they were)building the tunnel, the workers discovered an underground lake．

Unless(you are)invited, you should remain silent at the meeting．

Please speak English if(it is)possible and use Chinese when(it is)necessary．

They fell in love with each other years ago．＝It’s years since they fell in love with each other．

She was suffering from light infection and had a sore throat．

The peasants suffered from heavy taxes and hunger at that time．