1、Period ThreePeriod ThreeGrammar 语法感知本讲栏目开关语法感知知识储备ItItItsititPeriod Three语法感知本讲栏目开关语法感知知识储备ititititititPeriod Three语法感知本讲栏目开关语法感知知识储备It is important to remember this rule.It worried her a lot that her hair was turning grey.It is shameful the way he behaves himself before girls.Period Three语法感知本讲栏目开关
2、语法感知知识储备It is surprising that she should have married a farmer.Dont you find it a waste of time watching television toomuch?It is certain that his invention will lead to the developmentof production.Period Three知识储备it的用法（）本讲栏目开关语法感知知识储备Period Three知识储备本讲栏目开关语法感知知识储备Period Three知识储备本讲栏目开关语法感知知识储备Period Three知识储备本讲栏目开关语法感知知识储备Period Three知识储备本讲栏目开关语法感知知识储备Period Three知识储备本讲栏目开关语法感知知识储备eatingto helpto finishto walkto seeto have
