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参考答案

 Compounding, the combination of free morphemes, is another common way to form words. The over-whelming majority of English combination of words from the two of three classes– nouns, verbs and adjectives, and they fall into the three classes, as shown below.

In compounds, the rightmost morpheme determines the part of speech. Thus, greenhouse is a noun, whitewash is a verb. The leftmost morpheme takes the primary stress of the word. Thus greenhouse is distinguished from a green house, in which the stress is on house. 

The meaning of compounds is not always the sum of meaning of the components. A greenbottle is not a type of a bottle; it is a kind of fly. And a sugar-daddy is not sugar-coated father, but a woman’s lover who is both generous and too old for her.