②since , ever since , recently ,lately/of late , just ,so far , up to now /the past , for(in/during/over/through) the past(last) year , all this week ,意指「从过去到现在为止」，被修饰的动词必须使用现在完成式。
ex. Mcdonald‘s has become increasingly popular since it was been introduced to this country ten yearsago