SILENT LETTERS
Silent letters are letters that you can't hear when you say the word aloud, but they are very much there. This may prove to be frustrating for English learners as about 60% of English words have silent letters.
PHRASAL VERBS
A group of words ( known as PHRASES ) that consist of a verb and a preposition, or a verb and an adverb or both. What's interesting is that the meaning of the total phrase is in no way the meaning of any part of the phrase.