Meaning trap
come in
become available or useful
to become available, be received, or start being useful or important.
Don't mix these meanings
Same phrase, different job.
to become available, be received, or start being useful or important.
Another meaning of 'come in' is 'enter (a place)'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
This phone charger will come in handy when we travel.
Learning how to manage your time can really come in useful when you have a lot of assignments to complete.
Fix the pattern
One small grammar move makes it sound right.
Not: This will come handy one day.
Say: This will come in handy one day.
The phrase is 'come IN handy' — don't drop 'in'.
Which sounds natural?
Tap the one a native speaker would say.
'Come in handy/useful' is the set phrase; 'prove extremely useful' is formal.
Build natural chunks
Words that usually travel with it.
come in handy/useful
- handy
- useful
- one day
- later
Don't confuse it
Related
Other meanings and phrases to compare.
- come in (enter (a place)) — Another meaning of 'come in' is 'enter (a place)'; compare the examples to keep the meanings separate.