Cool MateHow come vs How so
When to use each in English, with meaning, register, and examples.
How come
InformalTop 2,000 (common)
How so
Top 3,000 (common)
Most formal: How soMost common: How come
| How come | How so | |
|---|---|---|
| Pronunciation | 🇬🇧 //haʊ kʌm//🇺🇸 //haʊ kʌm// | 🇬🇧 //haʊ səʊ//🇺🇸 //haʊ soʊ// |
| Meaning | Why is it? | Why or how do you say that? |
| Example | How come you didn't go to the party? | He didn't finish his project? How so? |
| Register | Informal | Neutral |
| How common | Top 2,000 (common) | Top 3,000 (common) |
| Collocations | how come that, how come you, how come it | how so?, how so that, tell me how so |
| Common mistakes | Used in formal writing., Confused with 'why'., Incorrectly connected to an explanation. | Using 'how so' in formal writing, Confusing 'how so' with 'why', Overusing in conversations. |
| Usage notes | Used informally to ask reasons for something. Not suitable for formal situations or writing. | Used to ask for clarification or to express surprise. More common in spoken language. |
Frequently asked questions: How come vs How so
What's the difference between How come and How so?
How come: Why is it? How so: Why or how do you say that?
Which is more formal: How come and How so?
How so is the most formal of these.
Which is more common: How come and How so?
How come is the most common in everyday English.
Can you show an example of each?
How come: How come you didn't go to the party? How so: He didn't finish his project? How so?
Can I use How come and How so interchangeably?
Not always. How come and How so are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.