I Key points of 1a 1.Thank you for inviting me to your food festival. Thank you for doing sth.“...而感谢” E.g:感谢你帮助我。Thank you for helping me. 2.He knew children should go to school instead of working in factories all day. insteadof“代替;而不是” E.g:我是否可以要可乐来代替果汁? CouldI have cola instead of juice? 3.He decided to fight against the bosses. fight against“与....作斗争/抗争” 4.As a result,a bad man killed him. as a result “结果”