When do leaves turn yellow?
They turn yellow in Autumn.
Why did his face turn red yesterday?
His face turned red because he met that beautiful girl.
What happened there?
It seemed that a boy had been killed by someone.
What's the weather like today?
It seems as if it is going to rain.
How is your English?
The course is becoming more and more difficult.
Do you feel cold?
Yes,it becomes colder and colder as time goes by.