Naturally-occurring conversation is immediate,unprepared speech,with the characteristic of online processing,so that speakers must search the appropriate linguistic sources to fit the certain communicative needs.Based on that,the paper discusses the conditional conjunct...MORE Naturally-occurring conversation is immediate,unprepared speech,with the characteristic of online processing,so that speakers must search the appropriate linguistic sources to fit the certain communicative needs.Based on that,the paper discusses the conditional conjunctio...