In HSK 6 grammar, under 词类 → 副词 → 时间副词, the forms include: 一时、不时、仍旧、依旧、一向.
一时
yīshí
for a while; a moment
不时
bùshí
from time to time
仍旧
réngjiù
still; as before
依旧
yījiù
一向
yīxiàng
always; all along
暂无。