$\text{10.}$ It was very cold , so they couldn't keep working in the field . 

$\text{11.}$ The fair was very noisy , so we couldn't hear each other . 

$\text{12.}$ They were very tired, so they could not continue working. 

→ so : mệnh đề liên kết 2 vế , nêu kết quả của 1 sự việc/hành động nào đó ) 

→ S + clause , so + S + clause 

→ so : vì vậy 

$#Keisha$

10. It was very cold, so they couldn’t keep working in the field.

form :` S+ verb ... , so + S+ verb.......`

11. The fair was very noisy, so we couldn’t hear each other.

form :` S+ verb ... , so + S+ verb.......`

12. They were very tired, so they could not continue working.

form :` S+ verb ... , so + S+ verb.......`