Answer:
The doctor tests for genetic disorders.
Step-by-step explanation:
I am not sure how to explain it. Well, to start it begins with the past, present, and future tenses. According to the University of Houston - Victoria, Past tense is used to describe actions that occurred in the past; present tense is used to describe actions that are currently taking place; future tense is used to describe an action that will take place in the future. The doctor in this sense is presently testing people as his/her or their job. It depends on the context but you can normally do this by just putting the different forms of the words into the sentence to see if it fits. I hope this helps :)