Used to indicate that something has only been true since the occurrence of something else.
I only started to seriously rethink my life once I graduated college.
Once I actually started going to museums, I realized that I really liked them.
I don’t know how Jared is so charismatic. Once he starts a trend, everyone else quickly follows.
Can be used to set up a condition in a hypothetical situation.
I’ll scratch your back if you scratch mine.
If something’s bothering you, don’t hesitate to tell me.
The conjunction “if” can be emphasized with the word “even.”
I wouldn’t tell you his secret even if you begged me.
Even if I’m having a bad day, I try to be nice to people.
Can be used to mean something like “pretending that something were true”
He treats me as if I were his sister, not his girlfriend.
Don’t try to lecture me as if you actually knew what you were talking about.
You tend to brush most things off as if they’re no big deal.
Can be used as an alternative to “just as.” Can be emphasized by the word “just.”
I did the dishes like you told me to.
The dish that was served looked just like it did in the menu.
Can also be used as an informal alternative to “as if”
Sometimes I feel like Keira ignores me on purpose.
Don’t treat me like I’m an idiot.
Can be used to introduce an exception to a statement
The professor said not to email her unless you have a logistical question.
I personally won’t date you unless I find you attractive.
The visiting team is going to win unless the tables somehow turn last minute.
Can be used to mean something like “for the possibility that something might happen”
I sent the message twice in case the first one didn’t go through.
Can you double check the document just in case there aren’t any errors?
A shortened form of “whether or not”
是“whether or not”的缩写形式
I’m not sure whether we’ll be able to hit everything on the itinerary.
Can you tell whether this was handwritten?
Do you care whether I’m in the room while you’re on the phone?
Can be used to mean “despite the fact that” or “regardless of the fact that”
Although he was a bit rude, people still found him funny and hung out with him.
Although the party was dull, I was still happy to see you guys.