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1·Jane's collecting shells on the beach.

简正在海边收集贝壳。

2·People are collecting shells.

人们正在捡贝壳。

3·Photo 172: People collecting shells.

图172：清晨捡贝壳的人们。

4·How long have been collecting shells?

你已经收集贝壳对久了？

5·How long has she been collecting shells?

她已经收集贝壳多长时间了？

6·Collecting shells is one of his hobbies.

收集贝壳是他的爱好之一。

7·He has been collecting shells for ten years.

他收集贝壳十年了。

8·I have been collecting shells for over two years.

我收集贝壳有两年多了。

9·The boys are walking on the shore collecting shells.

男孩子们走在海岸上拾贝壳。

10·Look! The boys are walking on the shore collecting shells.

看！男孩子们走在海岸上拾贝壳。