Mary is coming back from her visit to Shanghai. 玛丽很快就要从上海访问回来了。
3)现在进行时常与always, continually, constantly 等副词连用，表示反复出现的或习惯性的动作。
这种用法常表示说话人的某种感情，如赞扬、遗憾、讨厌或不满等。例如：
He is always asking questions. 他老爱提问题。
You are always saying that sort of thing. 你老爱说那样的话。
She is always complaining. 她总是喜欢抱怨。
4)在一定的上下文中，后一句的动词谓语用现在进行时与前一句的一般现在时相配合，
可用以体现原因、结果、目的等意味。即前一句用一般现在时动词谓语表述现在发生的事实，
而后一句用现在进行时动词谓语来阐明这一事实的原因、结果、目的等。例如：
He frowns. He is worrying about his boy. 他皱着眉头，因为他在为他的孩子担心。
She criticizes him. She is trying to correct his bad habits. 她批评他，想纠正他的坏习惯。
She lets her child have his own way. She is spoiling him. 她不管她的孩子。这是在把他惯坏了。(结果)
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