摘要:
PENNSTATE UNIVERSITY COLLEGE of the LIBERAL ARTS http://elearning.la.psu.edu/aplng/802/lesson-3/5.1-communicative-competance second language acqusitii 阅读全文
摘要:
http://grammarist.com/grammar/agent-recipient-nouns/ An agent noun denotes a person who performs an action. Most agent nouns end in either –er (standa 阅读全文