This Rule applies to those words in English that end with the letters
To translate them into Spanish, we will substitute the ending with
This ought to be very easy!
It is! We write them exactly as they are in English!
Well, not exactly: remember the Quirks! Also, no double letters (GG, MM, NN, PP, SS or TT) and F instead of PH.
For example, the English word "compulsion" is the same in Spanish except that we accentuate the last syllable (it ends in "..ión") [see "Accents", Chapter One].
Here are some Examples