Answer:
Children
Explanation:
A simple subject is the main subject in a sentence. Happy is describing the simple subject, pool could be a subject but not the main one. Play is the action the simple subject is doing.
Answer:
writing newspaper articles
Answer:
Across is the preposition.
Explanation:
A preposition is a word describing the location of something. <em>Across </em>tells you the location of something that is in front of and/or behind something else. Therefore, this is the preposition.
Hope this helps! :)