Meaning trap
come in
enter (a place)
to enter a room or building, especially after being outside or after knocking.
Don't mix these meanings
Same phrase, different job.
to enter a room or building, especially after being outside or after knocking.
Another meaning of 'come in' is 'become available or useful'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
She knocked on the door and waited for someone to tell her to come in.
If I arrive early for a job interview, I usually wait until someone asks me to come in before entering the office.
Fix the pattern
One small grammar move makes it sound right.
Not: Please come in to the room.
Say: Please come in. / Please come into the room.
Bare 'come in', or 'come INTO the room' — not 'come in to the room'.
Which sounds natural?
Tap the one a native speaker would say.
'Come in' is the everyday invitation to enter; 'you may enter the room' is stiff and officious.
Build natural chunks
Words that usually travel with it.
come in
- please
- and sit down
- out of the rain
- through here
Don't confuse it
Related
Other meanings and phrases to compare.
- come in (become available or useful) — Another meaning of 'come in' is 'become available or useful'; compare the examples to keep the meanings separate.