1. Comparison and contrast — like / as / as though / similarly (comparison), but / however / although / even though / despite / in spite of / nevertheless (contrast)
2. Cause and effect — because / because of / since / due to / as a result of (cause)/ in order to / so / therefore / consequently / as a result (effect)
3. Addition — and / in addition / moreover / furthermore / besides
4. Alternative — or / either … or / neither … nor / instead of / rather than
5. Chronology and process — before / after / afterwards / later / then / first, second, third / meanwhile
6. Examples — for example / for instance / such as / like
7. Attitude — fortunately / unfortunately / surely / certainly / undoubtedly / clearly / obviously / surprisingly