Unit  1   
1.add to    增强了、增加了 add...to...  把什么添加到.... add up to...  合计达.......2.get sth done =have sth done 使某事被做3.be upset about /at /over ...  心烦的4.calm sb down  使某人冷静下来5.have got to do=have to do 不得不做某事6.be concerned about  关心、
1.before  在什么之前，可以引导时间状语从句2.It's no wonder that...    难怪  It's a wonder that...     真奇怪3.There was a time when sb did sth    有个时期某人做某事4. on purpose =by design   故意  by accident =by chance  无意5.dare to do sth =dare do sth   敢做某事 dare not do sth =don't/doesn't dare to d ...