坦率地说，一开始我还不能跟上老师的讲课。
Frankly speaking, at first I had some difficulty following the teachers.
在英语课堂上，跟上老师的课我有些吃力。
I have much difficulty (in) following our teacher in English class.
那位心理学家让我父母为我请个辅导老师，帮我补上阅读课，并告诉我要同老师交谈，如果没跟上他们所讲的东西，要求他们重复一遍。
The psychologist wanted my parents to get me a tutor to help me catch up in reading and told me that I had to talk to my teachers and tell them to repeat something if I didn't catch it.
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