The words that contain only one morpheme are called（ ）
The word “ecology” is a two-morpheme cluster that contains（ ）
A very common way to form new words in English is to add affixes to existing forms. For example，"teacher" is formed by adding the affix -er to the existing form "teach", and "enlarge" is created by adding the affix en- to the existing form "large". These affixes are called （）affixes.
Some of the（ ）rules are productive; they can be used freely to form new words.
All the following morphemes can be definitely regarded as derivational morphemes EXCEPT （ ）
In the word suitable, "-able" is a（ ）morpheme.
In its history of development, English has dropped quite a few of its（ ） affixes; thus in terms of word endings, it is simpler than some other languages such as Russian, French, and German.
Morphemes which represent such grammatical categories as number, tense, gender, and case are called（ ）morphemes.
The word “manuscript” is a two-morpheme cluster which contains（ ）
Judge whether each of the following statements is true or false. Put a T for true or F for false on the Answer Sheet. If you think a statement is false, you must explain why you think so and then give the correct version.
Free morphemes are （）units of meaning and can be used freely all by themselves but bound morphemes must be combined with other morphemes to form new words.
（）morphemes are the independent units of meaning that can be used freely and all by themselves, such as help, table, and room.
The morphemes that are independent units of meaning and can be used freely all by themselves are called （）morphemes.
In using the morphological rules, we must guard against overgeneralization. Different words may require different （）to create the same meaning change.
In using the morphological rules, we must guard against （） in that different words may require different affixes to create the same meaning change.
（ ）modify the meaning and in many cases change the part of speech of the original word.
The suffix "-ly" can be added to a(an) （）to form its corresponding adverb, e.g. , happy+-ly＞happily, notable+-ly＞notably.
In the word unreliable, the prefix “un-” is a(n)（ ）morpheme.
Some morphemes are words such as help, table and room, which are independent units of meaning and can be used independently. They are called （）.