“It's getting harder and harder to earn a living as a photographer these days.”
You're a professional photographer. Websites that sell amateur photos for low prices are making it harder for you to make enough money. You say this while talking to an acquaintance who's not a photographer.
It's getting harder and harder to earn a living as a photographer these days.
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"These days" means "recently". But "recently" is used to talk about things that have happened over the last few weeks or months. "These days" is a longer time period, usually from the last 6 months to the last 20-30 years. You use "these days" to talk about major changes in your life or in society.
I don't watch much TV these days.
Kids these days don't even remember what life was like before mobile phones and the Internet.
When you want to describe something that continues to increase or decrease over time, you use the phrase "get ___er and ___er" or "get more and more ____". For example:
You just get more and more beautiful every time I see you!
Technology is getting easier and easier to use.
When an action is difficult to do, you say that "it's hard to ___":
It's hard to believe that we've already been married for five years. It seems like we just met.
It's hard to hear what you're saying with all the noise in here.
To "earn a living" means to make enough money to pay for your food, rent, car, and so on. You tell what job you're talking about with the phrase "earn a living as ___".
Do you think it's realistic to hope to earn a living as a musician?
The phrase "earn a good living" means to make more than just the basic amount necessary. A person who "earns a good living" isn't rich, but isn't poor either.
It used to be that you could earn a good living as a driver, but these days it's hard.