Это можно сравнить со следующим. Если человек в магазине примерил рубашку, то должен ее купить. Ведь он ее зачем-то мерит и тратит время продавцов-консультантов.
This can be compared with the following. If the person in the store wore a shirt, you should buy it. He's her reason merit and spends time sales consultants.
This can be compared with the next. If the person in the store tried on the shirt, it must buy it. After all, he did what for Merit and spends time sales consultants.
this can be compared with the next. if the man in the shop try on the shirt, you should buy it. because he did something trying, and spends time sales consultants.