In HSK 2 grammar, under 词类 → 副词 → 时间副词, the forms include: 还2、已经、有时（候）、快、快要、正.
还2
已经
yǐjīng
already
有时
yǒushí
sometimes
候
快
kuài
fast; quick
快要
kuàiyào
about to
正
zhèng
just; exactly
暂无。