现在进行时举例

假如我们正在做一件事，是不能用现在式的，而必须用现在进行式，现在进行式的形态是：
verb to be + present participle（现在分词）
verb to be 大家都懂，什么叫做现在分词呢？现在分词就是“动词＋ing”
以下是现在分词的例子
动词              现在分词
work              working
go                going
read              reading
run               running
play              playing
swim              swimming
sing              singing
write             writing
eat               eating
walk              walking
come              coming
love              loving
like              liking
watch             watching
smoke             smoking

如果我们说： 
I am watching a movie.
那是指我现在正在看电影。

这和：
I watch movies.
意义上截然不同的，I watch movies是说我有看电影的习惯。
因此有些动词是没有现在进行式的，举例来说：
I am loving you.
是不通的，因为严格说起来，love是一种状态，而不是一个动作。现在进行式，都是指动作，很少指状态的。
以下是现在进行式的例子：
I am calling my father.
He is swimming now.
He is playing basketball.
They are all eating now.
He is walking in the woods now.
He is reading a detective novel.
Mr. Brown is driving to work.
Mrs. Brown is cooking.
It is raining now.