英语作文,老师叫我们写一条现在和过去的变化,想想.

As time goes by, new discoveries and inventions were made. Last time, my mother's sewing machine was by pedaling, now her new sewing machine uses electricity. My father said that last time policeman wore short trousers, now the policeman wears long pants. My grandfather told me he wore underwear that were sewed by my great great grandmother, now I wear underwear that are made by Nike.