Пожалуйста,помогите найти инфинитив и определить его функцию.
1.     
The pa­tient is a person who is anxious about himself,
who asks another per­son to help him.


2.     
Doctor  wanted
to know the patient’s complaints
3.     
To make sure our bodies get all the vitamins they
need, it is best to include     
4. several different vitamin-containing foods in the
diet.
5. The primary separation of blood cells using a
centrifuge allows red blood cells, blood platelets and  granulocytes to be separated from each other.
6.The experimentalists found the decrease in body
temperature to increase urinary secretion.
7.How many reasons does he give to support this suggestion?

1. The patient is a person who is anxious about himself, who asks another person to help (дополнение) him. 2. Doctor wanted to know (дополнение) the patient’s complaints. 3. To make (обстоятельство) sure our bodies get all the vitamins they need, it is best to include (подлежащее) several different vitamin-containing foods in the diet. 5. The primary separation of blood cells using a centrifuge allows red blood cells, blood platelets and granulocytes to be separated (часть сложного дополнения) from each other. 6. The experimentalists found the decrease in body temperature to increase (часть сложного дополнения) urinary secretion. 7. How many reasons does he give to support (обстоятельство) this suggestion?