Am это форма глагола be настоящего времени. Вопрос следует задать немного точнее. Если интересует сокращенная форма, то это I`m.
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My brother has three english books. That girl has pink stockings. Those birds have a <span>big wings. Pigs have funny pins rings. We have English in the morning. Jerry has seven kangaroos on his farm.</span>
She/he/it - has
Всё остальное - was.
My name <span>Artem ////////////</span>
The customer is always right, because he/she pays money.
A lot of types of people in our world and every persone who offers different services must be ready for cruel/bad/nasty/<span>naughty people, because he/she decided to work in this </span>sphere and that did it on their own.