1. drop in
（相信朋友们上学的时候学的都是这样的表达，考级书、辞典里也有这种解释。）
Do drop in if you happen to be passing!
路过的时候一定要进来坐坐啊！
2. stop by
（这也是比较常见的用法，通常用翻译软件来翻译也喜欢用这个词组。）
She stopped by my place the other day.
几天前她顺便来我家坐了一会儿。
3. drop around/round
I'll drop around later when I'm free.
我有空会再来的。
4. Come round
Come round any evening.
晚上有空来串门。
5. drop
（相当得简明扼要。）
Drop if you're free.
6. fall in upon
They would just fall in upon us for a chat at any odd moment.
7. go round to
Let's go round to Neville's house this evening.
8. blow round /around
（形象生动的表达方法。）
Why don't you blow round next Saturday evening?
9. call in
Please call in at five.
10. come by
Come by anytime.
随时来串门啊。
