There are many such sequential rules in English. For example, if a word begins with a [l] or a [r], then the next sound must be a vowel. That is why [lbik] [lkbi] are impossible combinations in English. They have violated the restrictions on the sequencing of phonemes.
    The assimilation rule assimilates one sound to another by “copying” a feature of a sequential phoneme, thus making the two phones similar. Assimilation of neighbouring sounds is, for the most part, caused by articulatory or physiological processes. When we speak, we tend to increase the ease of articulation. This “sloppy” tendency may become regularized as rules of language.
    We all know that nasalization is not a phonological feature in English, i.e., it does not distinguish meaning. But this does not mean that vowels in English are never nasalized in actual pronunciation; in fact they are nasalized in certain phonetic contexts. For example, the [i:] sound is nasalized in words like bean, green, team, and scream. This is because in all these sound combinations the [i:] sound is followed by a nasal [n] or [m].
     The assimilation rule also accounts for the varying pronunciation of the alveolar nasal [n] in some sound combinations. The rule is that within a word, the nasal [n] assumes the same place of articulation as the consonant that follows it. We know that in English the prefix in- can be added to ma adjective to make the meaning of the word negative, e.g. discreet – indiscreet, correct – incorrect. But the [n] sound in the prefix in- is not always pronounced as an alveolar nasal. It is so in the word indiscreet because the consonant that follows it, i.e. [d], is an alveolar stop, but the [n] sound in the word incorrect is actually pronounced as a velar nasal, i.e. [ŋ]; this is because the consonant that follows it is [k], which is a velar stop. So we can see that while pronouncing the sound [n], we are “copying” a feature of the consonant that follows it.
Deletion rule tells us when a sound is to be deleted although it is orthographically represented. We have noticed that in the pronunciation of such words as sign, design, and paradigm, there is no [g] sound although it is represented in spelling by the letter g. But in their corresponding forms signature, designation, and paradigmatic, the [g] represented by the letter g is pronounced. The rule can be stated as: Delete a [g] when it occurs before a final nasal consonant. Given the rule, the phonemic representation of the stems in sign – signature, resign – resignation, phlegm – phlegmatic, paradigm – paradigmatic will include the phoneme /g/, which will be deleted according to the regular rule if no suffix is added.
10. What are suprasegmental features? How do the major suprasegmental features of English function in conveying meaning?
答：   The phonemic features that occur above the level of the segments are called suprasegmental features. The main suprasegmental features include stress, intonation, and tone. The location of stress in English distinguishes meaning. There are two kinds of stress: word stress and sentence stress. For example, a shift of stress may change the part of speech of a word from a noun, to a verb although its spelling remains unchanged. Tones are pitch variations which can distinguish meaning just like phonemes.
     Intonation plays an important role in the conveyance of meaning in almost every language, especially in a language like English. When spoken in different tones, the same sequence of words may have different meanings.

Chapter 3  Morphology
1. Divide the following words into their separate morphemes by placing a “+” between each morpheme and the next:
       a. microfile             e. telecommunication
       b. bedraggled           f. forefather
       c. announcement        g. psychophysics
d. predigestion          h. mechanist
答：a. micro + file                      b. be + draggle + ed
    c. announce + ment                  d. pre + digest + ion
    e. tele + communicate + ion           f. fore + father
    g. psycho + physics                  h. mechan + ist