在时间或条件状语从句中,一般现在时可以用来表示将来的动作.时间状语从句常由when,whenever,before,after,until,now(that),every/next time,as soon as,the moment/minute等词来引导.
【例如】
　　Please be sure to telephone me the next time you come.I will go with you whenever I am free.
　　I will go to visit my supervisor as soon as I arrive in Beijing.
B为何不用until