since due to …, for as this is why

　　5.表示递进关系

　　and then as well as again another also/too in addition (to) additionally additional besides (that) moreover furthermore not only … but also … what’s more

　　6.表示让步关系

　　though/although while even though/even if nevertheless in spite of/despite admittedly

　　7. 表示总结

　　in a word in brief in short above all all in all on the whole in general to conclude/in conclusion to sum up/to summarize/in summary