Let's fix the grammar in your paragraph about herons step by step.
Original sentence: 'Herons hunt frogs, fish and bugs in shallow water.'
This sentence is correct!
Next sentence: 'They stand very still and watch carefully.'
This sentence is good too!
Next sentence: 'Once they spot their food, they moves closer slowly and snatch it quickly with their beak.'
Here, there are two mistakes:
- Use 'move' instead of 'moves' because 'they' is plural.
- To make the sentence sound better, change the order of 'move closer slowly' to 'slowly move closer.'
So the corrected sentence is: 'Once they spot their food, they slowly move closer and snatch it quickly with their beak.'
Putting it all together:
Corrected Paragraph:
Herons hunt frogs, fish, and bugs in shallow water. They stand very still and watch carefully. Once they spot their food, they slowly move closer and snatch it quickly with their beak.