Tanks - " Fill a tank with tropical fish using your knowledge of plurals."(sadlier-oxford.com)
to practise 'there is - there are' "There are hidden dangers and we must be careful as we search the
island to find the lost treasure.
The game is played in pairs.
One students plays the pirate and hides the treasure.
The second student is the explorer and searches for the treasure." (mes-english.com)
Fishing - "Sort out what you catch." (english-online.org.uk)