第一，在进行时态中要用visit 的 -ing形式
The President is visiting china this week.
第二，用在介词短语里，介词后接visit 的 -ing形式
Thanks for visiting my post.
He blacked his shoes before visiting his father-in-law.
第三，充当名词或名词短语
Visiting a different place doesn't mean visiting a different time.
She said visiting her mother's grave was her only program.
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