跟不上时尚的英语怎么说

你可以用 "out of style" 或者 "not fashionable" 来表示跟不上时尚。这两个词都指的是过时或不流行的意思。
"Out of style" 是一个习惯用语，它的来源可能源自于时装潮流的变化。例如，一件衣服如果过时了，就可能被认为 "out of style"。
"Not fashionable" 是一个形容词，也可以用来表示过时或不流行的意思。
下面是一些例句：
My mom's clothes are so out of style. She needs to go shopping for some new outfits.
I can't believe I used to wear those shoes. They're so not fashionable now.
My grandpa's hat is out of style, but he doesn't care. He wears it everywhere.
I don't want to wear this dress to the party. It's not fashionable anymore.
中文翻译：
我妈妈的衣服太过时了。她需要去买些新衣服。
我简直不敢相信我曾经穿过那双鞋。它们现在真的不时髦。
我爷爷的帽子过时了，但他不在乎。他到处都戴着它。
我不想穿这件裙子参加聚会。它现在不再时髦。