1. 不要忘记:don't forget 或 remember.
2. 主要是以下两个同义结构:
1)Don't forget that
从句 = Remember that从句。
如:Don't forget that you are his son.
= Remember that your are his son.
不要忘记,你是他的儿子。
记住,你是他的儿子。
2)Don't forget to do sth. = Remember to do sth.
如:Don't forget to lock the door.
= Remember to lock the door.
不要忘记关门。
记住要关门。
参考资料:英语牛人团