如果像老师上课时那样写出：be+实意动词+ing 这样的结构可能不够清楚易懂,还不如举些例子来说明：
一般现在时：I water the flowers.The fowers are watered .
现在进行时：I am watering the flowers.The flowers are being watered.
一般过去时：I watered the flowers.The flowers were watered.
过去进行时：I was watering the flowers by this time yesterday.The flowers were watered by this time yesterday.
现在完成时：I have watered the flowers.The flowers have been watered.
过去完成时：I had watered the flowers.The flowers had been watered.
一般将来时：I shall(will) water the flowers.The flowers will be watered.
将来进行时：I shall be watering the flowers tomorrow.The flowers will be watered tomorrow.
