Friends are like chocolate cake
You can never have too many.
Chocolate cake is like heaven -
Always amazing you with each taste or feeling.
Chocolate cake is like life with so many different pieces.
Chocolate cake is like happiness, you can never get enough of it."
Throughout the poem, two things are compared which is a simile.
The main clause is "Chris's chief interest was tennis".
The subordinate clause is "Which he was just learning to play" and it is an adjective clause because it describes what the "tennis" was like. Tennis is an object and this subordinate clause further describes that it is the tennis that he was trying to learn.
Its an example of Primary document