it is a good idea for us this Saturday为什么不能是C

it is a good idea for us this Saturday为什么不能是C it is a good idea for us this Saturday.为什么不可 I think it will be a good idea for us thai is a good idea可不可以说this is a good idea.为什么要用that,不用this it is good for us 中译英:It's a good idea to put away some money for emergency us It is really a good ( c ) for us to practic english This is a good ___(开始)for all of us. It is a good idea改为感叹句 ( )is it a good idea ____eng for many of us ,the idea of a family is a lot narrow than it it is good for us to be动词是哪个?