A child acquires his or her mother tongue in a sequence of identifiable stages： ______ , one-word, two-word and multiword during a very specific maturational period of human development.

Please define competence and performance respectively and describe their differences.

According to John Austin, what are the three acts a speaker might be performing simultaneously while speaking? And give examples to illustrate them.

language centers

interlanguage

utterance meaning

language standardization

coinage

root

linguistic context

AUX-movement