close 是动词,关闭的意思.是形容词,近的,意思.closely是副词,就是上面那个形容词的变体,靠近地的意思.closed是形容词,关闭了的,意思.closing是动词的现在分词,正在关闭的

作形容词解时，区别如下：

一，Close :（在空间、时间上）接近; 几乎(处于某种状态); 亲密的, 密切的… … 

如:

 I had no idea the beach was so close.

我不知道海滩原来这么近。

He was close to tears.

他几乎快掉眼泪了。

The new library is close to completion.

新图书馆快要竣工了。

Jo is a very close friend.

乔是我们亲密的朋友。

二，Closed:关闭; （尤指一段时间）停止营业，不开放; 封闭的, 闭关自守的, 不愿接受新思想的, 

如:

 Keep the door closed.让门关着吧。

. The museum is closed on Mondays.博物馆每逢星期一闭馆。

. This road is closed to traffic.这条道路暂停通行。

He has a closed mind.他思想僵化守旧。

 Everything was going on behind closed doors.一切都在秘密地进行着.

三，closing [只用于名词前]（讲话、时段或活动）接近尾声的，结尾的，结束的, 如:

His closing remarks; the closing stages of the game.他的结束语； 比赛的结束阶段。

 They almost won the match in the closing minutes.最后几分钟的时候他们差一点赢了这场比赛。