See the light at the end of the tunnel

A tunnel is a dark place you have to pass through to arrive somewhere.
To see the light at the end of the tunnel is to begin to see the end of a difficult situation or period. Here are a few examples:
After working continuously for the past three months, we're finally seeing the light at the end of the tunnel.
You'll feel better when you see the light at the end of the tunnel!
The worst part of a project is when you can't see the light at the end of the tunnel.

See you later, alligator!

Okay, maybe I didn't get quite enough sleep last night.

Or maybe I'm just in a good mood after Spanish class with the incomparable María.

In any case, I can't resist posting this expression.

We say this to kids when we're saying goodbye. Here's an example:

You: See you later, alligator!

Your seven-year-old: In a while, crocodile!

Try it. I guarantee at least one of you will smile!

This post is dedicated to my dad, who always makes me smile!

Long time, no see!

If you haven't seen a person for a long time, you can say "long time, no see!"
You could also say this ironically, if you have just seen the person.
This expression is very informal.

To not see the forest for the trees

To not see the forest for the trees means that you don't see the big picture because you're too focused on the details. So this expression means to lose perspective.
Does this ever happen to you? I suppose that many of us have jobs or other responsibilities that demand some attention to detail, which can result in not seeing the forest for the trees. Certainly we can see other people losing perspective, in sports, politics, etc., and making mistakes they might have avoided. What's the risk of not seeing the forest for the trees? I guess the most serious risk is forgetting what's really important. Getting caught up in the details can make it more difficult to remember the real reason that we're doing something.
What do you think?

To be seeing someone

If you're seeing someone, it means that you're dating. It may mean more or less involvement, depending on the situation, but it always means that you're spending time with the person in a romantic way. Here are a couple of examples:

Him: Would you like to have dinner with me on Saturday?
Her: Um, actually, I'm seeing someone.
Him: Oh.
*******
Her: He seemed pretty disappointed when I told him I was seeing someone.
Her friend: Yeah, I bet he was. But are you really serious about Felix?
Her: Well, we've been seeing each other for a while now, but I'm not sure...
*******
As you can see, we usually encounter this phrasal verb in the continuous, and we don't usually use it in the future. So we would say "He was surprised that she was seeing someone," to express a situation in the past.

Expression: See the world through rose-colored glasses

If you see the world through rose-colored glasses, it means that you always see things in a positive way.
You could also see a person this way, or a situation.
Although many people think that it's good to see things through rose-colored glasses, others argue that it's unrealistic to see everything this way all the time.
What do you think?

(This image is by Salvador Dali.)