主题句的位置可以在段中：
MY parents have gone out for the evening.Just as I settle down to read orwatch television.my little brother demands that I play with him.If I get a telephonecall.he screams in the background or knocks something over.I always have tohang up to find out what’S wrong with him.Baby-sitting my brother is no fun.Herefuses to let me eat a snack in peace.Usually he wants half of whatever I have toeat.Then，when he finally grows tired，it takes about an hour for him to fall asleep.
主题句的位置可以在段末（见前例）。
主题句在段首段尾同时出现：
Good manners are important in all countries,but ways of expressing goodmanners are different frOm country to COuntry.Americans eat with knives and forks；Japanese eat with chopsticks.Americans say“Hi”when they meet；Japanese bow.Many American men open doors for women；Japanese men do not.On the surface，it appears that good manners in America are not good manners in Japan，and in away this is true.But in any country，the only manners that are important are thoseinvolving one person’S behavior toward another person.In all countries it is goodmanners to behave considerately toward others and bad manners not to.
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