1 In case he comes,let me know.如果他来的话,告诉我一声.
在以when,after,before,till,until,the moment,the instant,instantly (一…就),immediately(一…就),once,as soon as,directly(一…就)引导的时间状语从句和以if,in the event that(如果),on condition that(如果),in case(如果、万一),provided(如果…的话),providing (如果…的话)引导的条件状语从句中,必须用一般现在时表示将来.
2 The human body has certain materials in it which may kill the germs.是个which引导的定语从句,主句就是the human body has materials
3 The road isclear of snow now.街道被雪覆盖变的干净