1. Morphology In American English, a number of irregular verbs have become regularised, while remaining irregular in British English: a)In many instances, it is only the voicing of the past tense morpheme -(e)d which has been changed to regularise the verb:
Restriction of Meaning Restriction of meaning means that a word of wide meaning acquires a narrower, specialised sense which is applicable to only one of the objects it had previously denoted
unilateral, bilateral, trilateral multilateral monogamy, polygamy inflexible, imbalance, irrational, illegal download, copyright, mother wit, green wealth We summered in Qingdao last year. English Lexicology(I)