标志词：and;and also;or;neither nor;either or;not only…but(also)…;the former…the latter…;in the same way;that is tosay;similarly;like wise;equally;as well as,the same…as;
标志词：also;then;besides;in addition;additionally;further more;what is more;moreover;indeed;apartfrom;aboveall
标志词：because;for;since;as;therefore;consequently;hence;so;thus;so…that;such…that;accordingly;due to;thanks to;as a result;in that(=because);because of;considering that,seeing that;in response to;for this reason;
标志词：but、however、otherwise、never the less、yet、rather、though
标志词:although;though;even though;even;even if;despite;inspite of;while;as;
Eg.While he loves his students,he is very strict with them.
King as he was,he was not happy/Child as he is,he knows a lot.
Hard though/as he tried,he failed.
标志词while;where as;as;in stead of;rather than;not…but;
标志词such as,for example,for instance,of(these,those,them);among(these,those,them),to illustrate,as an illustration,totakeanexample,mores pecifically speaking,namely.
标志词when;whenever,before;after;since;as;while;until;till;simultaneously;meanwhile;in the meantime,at the same time;