英语同义句转换 ,要答案.1,culture differs from country to country cultu

英语同义句转换 ,要答案.
1,culture differs from country to country
culture differs from --- country to ---
2,it is very important to be on time in america .
--- --- on time is very important in america .
3, he may spend a couple of minutes talking about other things .
it may --- him a couple of minutes --- talk about other things .
4, unless you help your friends , they will feel unhappy .
--- you --- help your friends , they will feel unhappy .