What has happened in these situations?
The tree was only three metres high. Now it is four. The tree —.
Jack had a beard. Now he hasn’t got a beard. He has shaved off his beard.
Linda was here five minutes ago. Now she’s in bed. She has gone to bed.
The temperature was 25 degrees. Now it is only 17. The temperature has dropped. (drop)
The light was off. Now it is on. Somebody has turned it on.
The tree was only three metres high. Now it is four. The tree has grown.
The plane was on the runway a few minutes ago. Now it is in the air. The plane has taken off.