In other words, the clause without a conjunction is able to stand alone, while the clause that contains the conjunction cannot. Subordinating conjunctions examples:
I don’t like cake because it’s too sweet.
This sentence consists of two clauses, “I don’t like cake” and “it’s too sweet,” both connected by the subordinating conjunction “because.”
这给句子里包含两个句子，即“I don’t like cake”和 “it’s too sweet”。这两句话由从属连词“because”连接。
The clause that stands alone is “I don’t like cake” and can form its own separate sentence. The clause “because it’s too sweet,” however, cannot stand alone and instead subordinates to the first clause. “I don’t like cake”
这个句子可以单独存在。但是如果句子“because it’s too sweet”从属于前一个句子，它则不能单独存在。
Note that unlike with coordinating conjunctions, subordinate clauses can appear before or after the independent clause.
For example, while you could say, “I don’t like cake because it’s too sweet,” you could also say, “Because cake is too sweet, I don’t like it.”
举个例子：你可以说“I don’t like cake because it’s too sweet”也可以说“Because cake is too sweet, I don’t like it.”
Used to introduce a cause or a reason
I didn’t answer your messages because I was out of the country.
Because my lower back kept hurting, I decided to finally go see a chiropractor.
Can be used to introduce a cause or a reason
I decided to bake cupcakes, since it was Marjorie’s birthday.
Since you’re always late, I’m going to start showing up late too.
Can also be used to indicate that something has been true starting from a certain point in time.
I’ve been broke since my last vacation to Puerto Rico.
Ever since I was young, I’ve always wanted to become a scientist.
What have you been up to since school ended?
Can be used to indicate that an event only happens up to a certain point in time.
I usually sit around in my office until my boss gives me work to do.
Until you came into my life, I wasn’t quite sure where I would find love.
When I was in college, I would study until I passed out at 3 or 4 in the morning.
Can be used to indicate that two events happened simultaneously
When it started to snow, everyone started posting statuses on Facebook.
When the clock struck three, all the students immediately evacuated the classroom.
I don’t know how to react when you yell at me like that.
Can be used to indicate that when one event happens at any point, so does another
Whenever I try to comfort people, I somehow make things worse.
I hate it whenever I run into coworkers outside of work.
Whenever you start feeling anxious, just try to breathe.
Can be used to indicate that two things happen simultaneously. It emphasizes the continuousness of an action more than the conjunction “when.”
I often get distracted while trying to study.
It’s hard trying to take classes while also working two jobs.
While my parents were away for the weekend, my brother and I decided to throw a house party.
Can also be used to switch from one idea to another
While puppies are cute, they can be incredibly annoying to take care of.
Neutral colors tend to go together easily, while other colors are harder to pair up well.
Can be used as an alternative to “while”
We can see what logistical problems come up as we move on with the project.
As the night drew on, the crowd became noisier and noisier.
My dad entered the driveway right as I called to see where he was.
Can also be used as an alternative to “since” or “because”
You should be careful going to the gym, as your ankle is still a little weak.
Can also be used to mean something like “in the manner of.” Can be emphasized by the word “just”
I wrote my essay with five paragraphs just as my professor told me to do in the instructions.
I took the dog out three times a day just as you told me to.
Just as you requested, here’s your coffee with soy milk instead of regular milk.