【正确答案】(1)Borrowing is a process by which words are borrowed from other languages，e．g．
Parliament was borrowed from French，and balcony from Italian；
(2)Compounding is a process of combining two or more words into one lexical unit．e．g．
Sailboat，four-year-old；
(3)Blending is a process of forming a new word by combining parts of other words，e．g．
smog(smoke+fog) motel(motor+hotel)
(4)Back formation is a process by which new words are formed by taking away the suffix of an existing word，e．g．
edit(editor) typewrite(typewriter)