The sentences, when the commas have been put in the right place would be:
- The morning before her trip, with her dog in the kennel, the house felt very lonely to Amelia.
- My father has to cut the grass every day; the yard is so big, by the time he finishes cutting it at the end of the week, it is time to start again.
- "I am very pleased with my new desk," Mary told us. "I sat there for hours working on a project last night."
- A Saturday morning just isn't complete without a pancake breakfast.
- Every time I see Jonah, my heart starts fluttering in my chest; he's so cute.
- My mother always keeps fresh cut flowers in the house, and often uses baby's breath in the bouquets because it makes the bouquets look fuller.
- There never seems to be enough time in the day to get done everything I want to do.
- Since my mother started freelancing, it seems like she is always working; I never get to see her anymore.
- This weekend, we need to go to the grocery store, since we are out of nearly everything.
- Even though it seems young, my seven-year-old sister has a cell phone.
- The best things in life are free, except for food; you have to pay for that.
- "I'm irritated," Tina said, "because there are no paper clips in the supply closet."
How to use commas ?
Commas are used to separate items in a list. For example: "I bought apples, oranges, and bananas." When connecting two independent clauses with coordinating conjunctions (and, but, or, nor, for, yet, so), a comma is used before the conjunction.
Commas are used to set off nonessential information—words, phrases, or clauses that can be removed without changing the sentence's essential meaning.