【正确答案】：
THE LIMITED NUMBER OF VERBS ARE CREATED EITHER THROUGH CONVERSION OR BACK-FORMATION. 
CONVERSION IS THE FORMATION OF NEW WORDS BY CONVERTING WORDS OF ONE CLASS TO ANOTHER CLASS. THIS IS A METHOD OF TURNING WORDS OF ONE PART OF SPEECH TO THOSE OF A DIFFERENT PART OF SPEECH.
THROUGH CONVERSION：NICKNAME N.——TO NICKNAME. TO BE OR ACT AS N.
BACK-FORMATION IS  THE METHOD OF CREATING NEW WORDS BY REMOVING THE SUPPOSED SUFFIXES.
THROUGH BACK-FORMATION: BOTTLE-FEEDING N.——TO BOTTLE-FEED. AS SHOWN BY THE EXAMPLES, BACK-FORMED VERB COMPOUNDS ARE FORMED MAINLY BY DROPPING THE SUFFIXES: -ER, -ING, -ION, ECT.
【题目解析】：这些有限的动词复合词是按转类法或逆生法构词的。转类法通过把一个词类的单词转换成另一个词类来形成新词。nickname：绰号，本身是名词，通过转类法名词转化为动词，这个名词所表示的事物转化成这个名词所表示的事物的动作，to nickname：给...起绰号。逆生法通过除去假定的后缀而创造新词的方法。逆生法构成的动词复合词主要是把后缀-er, -ing, -ion等去掉而构成的。