Since we don't have the content of the 'grandson put the boy together story', it's impossible to determine its main idea. It could range from a story about a grandson's act of kindness towards a boy in distress to a more complex narrative about building something together. Without more information, we can only wonder what it could be about.
I'm not sure which specific 'grandson put the boy together story' you are referring to. There could be many fictional or personal stories with such a title. Maybe you can give some more details about it.
Since I don't know the exact 'the girl boy story', I can't say for sure. But generally, it might be about the relationship between a girl and a boy.
As I don't know the exact'memory boy story', it could be about the power of memory in general. Maybe the main idea is how the boy's memory shapes his identity, experiences and relationships.
The main idea might be centered around the relationship between the boy and the train. It could be that the train represents freedom or a new opportunity for the boy. He could be trying to reach a destination on the train, or it might be a story about how the train impacts his life in some way. For example, he might meet interesting people on the train or have a self - discovery during the train journey.
As I don't know the story, it could be about the boy's pursuit of a dream related to wearing a leotard. Maybe he wants to be a great dancer or athlete and the leotard is part of his journey.
The main idea might be about the encounter and relationship between a boy and a king. Maybe it shows how their lives intersect, and they learn from each other.
As I don't know the specific 'Popsicle Boy Story', it's hard to say the main idea. But it might be about the boy's relationship with popsicles, like his love for them.
The main idea is often about a boy and his relationship with a cricket. Maybe it's about how the cricket brings some special experiences or lessons to the boy.
As I don't know the specific 'the boy' story, I can't determine the main idea. It could be about the boy's self - discovery, his relationship with others, or his pursuit of a dream.
Perhaps the main idea is centered around the boy's experience of being called 'it' and how he copes with it. It might show his resilience in the face of this dehumanizing form of address, and his attempts to break free from the limitations it imposes on him.