How come + (subject + verb)

When using ‘how come’ you are asking why a particular thing has or had to take place.

Here are some examples:

“How come parents worry so much?”
“How come people carpool to work?”
“How come you are so upset?”
“How come he will not call you?”
“How come you stayed out so late?”
“How come you cannot make a decision?”
“How come you always question me?”
“How come we never agree?”
“How come your dog digs in the yard?”
“How come she will not come over?”

How much does it cost to + (verb)

You are simply asking how much you would need to pay to do something.

Here are some examples:

“How much does it cost to fly to Europe?”
“How much does it cost to own a house?”
“How much does it cost to play a round of golf?”
“How much does it cost to join a gym?”
“How much does it cost to repair my car?”
“How much would it cost to talk long distance?”
“How much would it cost to run a website?”
“How much would it cost to wash my car?”
“How much would it cost to rent a car?”
“How much would it cost to go to the movies?”