1. 及物动词与不及物动词

及物动词:后接名词或代词作宾语。
I forgot my wallet.(我忘了带钱包。)
不及物动词:单独使用,不带宾语。
"What's her name?" "I forget."(“她叫什么名字?”“我忘了。”)
2. 后接动词形式
forget to do sth:忘记要做某事(未做)。
She forgot to turn off the light.(她忘了关灯。)
forget doing sth:忘记做过某事(已做)。
He forgot locking the door and tried again.(他忘了自己锁过门,又锁了一次。)
forget having done:更明确表达“忘记做过”。
I forget having met him before.(我忘了之前见过他。)
3. 介词搭配
forget about:后接名词或动名词,表示“忘记某事”。
Don't forget about the meeting tomorrow.(别忘了明天的会议。)
She forgot about sending the email.(她忘了发邮件。)
4. 时态应用
完成时:强调过去动作对现在的影响。
I have forgotten his number.(我忘了他的号码。)
过去完成时:过去某时间点前已忘记。
By noon, I had forgotten the incident.(到中午时,我已忘了那件事。)
5. 固定短语与习语
Forgive and forget:既往不咎。
Let's forgive and forget.(让我们既往不咎吧。)
Not forgetting:提醒不要遗漏。
Pack your clothes, not forgetting socks.(收拾衣服,别忘了袜子。)
Forget it!:口语中表拒绝或放弃。
"Can I borrow $100?" "Forget it!"(“能借我100美元吗?”“休想!”)
6. 与其他动词的区别
forget vs. leave:
I left my keys at home.(正确,指“遗留”)
I forgot my keys.(正确,指“忘记带”)
错误:I forgot my keys at home.(应用 left)
7. 后接从句
可直接接 that 从句,表示忘记某事实。
He forgot that today was her birthday.(他忘了今天是她的生日。)
8. 否定与疑问句
否定句:提醒不要忘记。
Don't forget to call me.(别忘了打电话给我。)
疑问句:确认是否忘记。
Did you forget to submit the report?(你忘了交报告吗?)
9. 其他注意事项
过去分词形式:英式与美式均用 forgotten,forgot 为非标准用法。
进行时态:表逐渐遗忘,较少使用。
I'm forgetting how to speak Spanish.(我渐渐忘了怎么说西班牙语。)
通过以上分类,可全面掌握“forget”的用法,注意区分不定式与动名词的语义差异,避免与“leave”混淆,并在口语中灵活运用固定表达。