给你一个类型的举例,其他的需要你自己去归纳。
宾语从句的时态,主从句可以不一定一致。从句是依据实际需要选定合适的时态。
Could you tell me who knows the answer,please?你能告诉我谁知道答案吗?
He hasn't decided if he'll go on a trip to Wuxi.他还没决定是否去无锡旅行。
The teacher said that the earth goes round the sun.老师说地球绕着太阳转。
Do you know when he will come back tomorrow ?你知道他明天什么时候回来吗?
He will come if it doesn't rain.如果不下雨,他会来的。