词组:on time 准时,按时
造句:She arrived at the office on time.
她准时到达了公司。
词组:all the time 一直,总是
造句:She keeps optimistic mind to everything all the time.
她一直对所有事情都保持乐观态度。
词组:have a hard time(in)doing sth 做……很困难
造句:She once had a hard time learning English grammar and expression.
她之前学习英语语法和表达方式经历了一段困难时期。