however， on the other hand，
despite，in spite of，though，although，but，on the contrary
otherwise， yet，instead of，rather，whereas， nonetheless compared with，in contrast
Certainty 确定
obviously， certainly，plainly，of course，undoubtedly
Condition 条件
if， unless，whether，provided that，for，so that，whether，depending on
Time 时间
before， since，as，until，meanwhile，at the moment，when，whenever，as soon as，just as
Addition 此外
in addition， and，similarly， as well as，besides，furthermore，also，moreover，too， not only ... but，even，besides this/that
Sequence 顺序
first， initially，second etc.，to be?gin with，then，next，earlier/later，following this/that，afterwards
Consequence 结果
as a result， thus，so，therefore，consequently，it follows that，thereby，eventually，to that case，admittedly
