Grammar Note
常与on连用，后接人
顺便拜访；串门
drops in — third person singular of drop in
先理解核心含义，再看它在真实句子里的用法。
顺便拜访；串门
To arrive casually and unannounced, usually for a brief visit; to visit without an appointment.
I'll drop in on my grandmother on my way home.
我回家的路上会顺便去看看我奶奶。
非正式
非比喻或习语用法:参见 drop, in。
Used other than figuratively or idiomatically: see drop, in.
不请自来,毫无预兆地到来；也指未经预约拜访。
To arrive casually and unannounced, with little or no warning; also, to visit without an appointment.
划入并抢乘其他冲浪者已在冲的浪。
To paddle into and take off on a wave another surfer is already riding.
塌陷；坍塌。
To fall in; to cave in.
drop in
Base
原形
drops in
3rd person
第三人称单数
dropping in
-ing
现在分词
dropped in
Past
过去式
dropped in
Past participle
过去分词
She often drops in on her grandmother.
她经常顺便去探望祖母。
He dropped in yesterday for a chat.
他昨天顺便来聊了一会儿。
They have dropped in several times this month.
这个月他们已经顺便来了几次。
短语动词，意为顺便走访，动词部分drop为规则变化。
Why don't you drop in for a cup of coffee sometime?
你为什么不找个时间顺便来喝杯咖啡呢？
She dropped in at the office to pick up her mail.
她顺便到办公室取她的邮件。
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常与on连用，后接人
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.