(not) at all

The phrase "not at all" means really, completely none. It's a very extreme way of saying "not".

The word "not" can also be replaced by any negative word - "no", "don't", "nothing", "isn't", etc.

There was no one there at all.

I didn't say anything at all for the entire trip.

(something) doesn't do (something) justice

When a description, a photograph, or a recording of something isn't as great as the original, you can say "it doesn't do it justice".

You can say "it doesn't do it justice" about things like:

• a joke that was originally very funny, but you re-told it incorrectly
• a view was very beautiful, but your photographs of it aren't as beautiful

You can't possibly (do something)

This phrase means that something isn't possible. You use this expression to strongly state an opinion.

You can't possibly understand what it's like if you've never had children of your own.

You can't possibly prefer strawberry ice cream to vanilla! (In this case, it means "I can't believe that you prefer...") 

the essence of (something)

The "essence" of something is its most important and essential qualities.

It's hard to give a simple example because English speakers think of the "essence" of something as being like a kind of shapeless liquid or gas. 

Here are some things that English speakers often talk about "the essence" of:

the essence of the problem

the essence of who you are

the essence of an experience

capture (something) on film / video

"Capturing" something on film means taking a photo or a video of it.

You should especially use this phrase to talk about shooting film or photos of a short, special, rare event. For example, if you take a video of the first time that your child walks, you can say that you "captured the moment on video".

Even though most modern cameras don't use film, you'll probably still hear English speakers say "capture on film" sometimes.