Both vs Either vs Neither

1) Both
     - the two alternatives ( 2 alternatif)
     Eg: I can speak both English and Spanish

2) Either
     - one of the two alternatives ( 1 daripada 2 alternatif)
     - this OR that ( ini ATAU itu)
     Eg: I can speak either English or Spanish. Which is easier for you to understand.

3) Neither
    - none
    - not this AND none the other (bukan kedua-duanya)
    Eg: I can speak neither English or Spanish

All of sudden

All of sudden
- suddenly (tiba-tiba)
- unexpectedly
- without warning
Eg:  All of sudden, the dog began to bark lodly.
       All of sudden, the earth began to shake.
       All of sudden, it started to rain very hard.
       I was riding my bicycle, when all of sudeen I hit a bump and fell off.. 

Idioms

1) Behind Someone's Back
     - Without someone's knowledge (Tanpa pengetahuan seseorang)
     - When someone is absent 
     Eg: I don't like talking behind someone's back.