Sentence grammar

Question

An officer must have the competence/ thier competence to perform his duties.

 

Officer Perez is dispatched to a motor vehicle accident in the area of Long Ave. and Taylor Street intersection. The address numbers go up in each direction, north, south, east, and west. Officer Perez visited the following address to questions witnesses, 521, 532, 525,512, and 511. If he visited the addresses from south to north, in what order did he visit the addresses.

 

During the chaotic night, four businesses/business'/business's/businesses' windows were broken and the contents taken.

Answer 1

"the competence," because otherwise you've changed from singular tense (an officer) to plural (their) to singular again (his).

 

It may be better to say something like "An officer must be competent enough to perform his duties." or "An officer must have the competency to perform his duties."

 

 

"businesses'," since there are multiple businesses and they each possess their windows (hence the apostrophe).