(现在式am,is,are;过去式was,were;现在分词being;过去分词been)
The world is round.
地球是圆的。
What are you going to be when you grow up?
你长大后打算干什么?
The next match will be at 3 o’clock.
下一场比赛将于3点钟开始。
The lamp is on the table.
灯在桌子上。
They’re here till Christmas.
他们在这里一直逗留到圣诞节。
The economy is in a terrible condition.
经济非常不景气。
Were you at the party yesterday?
昨天你去参加聚会了吗?
Have you ever been to Beijing?
你去过北京吗?