Jenny wanted to know the difference between every day and everyday. Click here for the answer (at the bottom of the page).

Jin wanted to know the difference between a diploma and a degree. The answers seem to follow what I said in class after thinking about it for a minute.

Bond wanted to know the "difference between 'too' and 'neither' or 'neither' and 'either' or 'either' and 'too'."

Well, too and neither is a big difference. We use too in many ways, but in comparison with neither I guess you are thinking about, "Me too!" and "Me neither!"

We use too when we agree and have the same experience/feeling.

I love kimchi

I have been to China.

I hate dduk.

I think English is fun.

                                         Me too.

I don't like chicken liver

I haven't been to Russia.

I don't mind Pepsi.

I don't think English is easy.

                                             Me neither/either.

In the examples above both neither and either are acceptable. For more information on these words, please click here and here.

I hope that I answered the questions well enough. If you still have any questions, please let me know. 

Bond also wanted to know the difference between 'until' and 'by'.

Here are two examples that might help:

She won't be back until 5 o'clock.

She won't be back by 5 o'clock.

Which is correct? Actually they both are. The difference is in the meaning. 

The first one means that she will be back at 5 (exactly).

The second means that she will come back sometime after 5.

So, if you teacher says, "You have until Friday at 4:00 to give me your homework" 4:01 is too late.

A teacher might also say, "I want your homework in my hands by 4:00 on Friday." You can hand it in anytime before then.

Here is some practice with these words.

Diane wanted to know the difference between burned and burnt. I said that they are basically the same. It is more like just a difference between US and British English. A more thorough explanation can be found here.

Jin was curious about the difference between during and while.

During is a preposition and is usually followed by a phrase without a verb.

          ex. During the course, I realized I love English.

               During breakfast, the phone was ringing.

               During the game, Jason made a three-pointer.

While is a conjunction and is usually followed by a phrase with a verb (often continuous)

          ex. While studying, I realized I love English.

               While eating a banana for breakfast, the phone was ringing

               While he played basketball with his classmates, Jason made a three-pointer.

And another example (stolen from the internet):

During our conversation he constantly wrote down everything I said.

While I was speaking to him, he was constantly writing down everything I said.

I guess someone will want to know the differences between trip, travel, and journey.

This link explains it far better than I could.  Thank you, BBC.

Actually, I think that the BBC page for learning English is quite good.