คำบุพบท หรือคำเชื่อม ที่ได้แก่ by, in, on, at, out เป็นอะไรที่บางครั้งเราก็สับสนเหมือนกันว่าจะใช้อย่างไง ใช้ได้กับคำไหนๆบ้าง แล้วใช้ถูกไหมเนี่ย! เพื่อตัดปัญหากังวลใจของใครหลายๆคน มาดูชุดคำศัพท์ที่ใช้คู่กับคำเหล่านี้กันดีกว่า เอาไว้เช็คไว้ดูกันไปเลยว่าคำไหนคู่คำไหนบ้าง เตรียมจดได้เลยจ้า
| BY | IN | ON | AT | OUT |
| by chance | in time | on watch | at high speed | out of fashion |
| by the name of | in demand | on schedule | at risk | out of print |
| by luck | in of focus | on the record | at one’s side | out of step |
| by accident | in an uproar | on the road | at the outset | out of breath |
| by air | in answer to | on oath | at the end | out of context |
| by sea | in arrears | on the air | at war | out of control |
| by land | in danger | on balance | at the double | out of curiosity |
| by all accounts | in debt | on a diet | at one time | out of jealousy |
| by all means | in decline | on a journey | at a discount | out of date |
| by appointment | in defense of | on a trip | at a distance | out of doors |
| by birth | in detail | on a small | at a glance | out of duty |
| by check | in disgrace | on a pension | at a guess | out of hand |
| by coincidence | in ink | on a spree | at a loss | out of ideas |
| by courtesy of | in fact, | on account of | at noon | out of one’s mind |
| by definition | in fairness to | on an island | at a price | out of order |
| by degrees | in favor of | on approval | at a rate of | out of pity |
| by design | in fear of | on average | at a speed of | out of place |
| by dint of | in flames | on bail | at all costs | out of practice |
| by far | in flower | on behalf of | at all events | out of reach |
| by force | in full | on board | at issue | out of respect |
| by hand | in future | on business | at least | out of sight |
| by law | in hand | on order | at peace | out of spite |
| by marriage | in harmony | on remand | at liberty | out of stock |
| by means of | in honor of | on strike | at most | out of the |
| by mistake | in high spirits | on the agenda | at night | out of work |