TOEFL or no TOEFL?

I frequently get e-mails from students asking if I'll supervise them for a master's or Ph.D. degree. A letter I received a few days ago includes this text:

Whether do  i need to have GRE and TOFEL even i already had bachelor degree from USA and the coming master degree?

The acronym TOEFL (not TOFEL) stands for "Test of English as a Foreign Language".

A grad-student's command of the English language is a very important consideration. A word of advice. Make sure your cover letter isn't peppered with grammar mistakes.