Поставьте слова в отрицательную форму: 1.He works at the same factory. 2.My brother tells us nice stories. 3.I speak English well. 4.My sister helps me (to) do my homework. 5. Those foreign students speak Russian. 6.The librarin helps us (to) choose books for home reading. 7. We listen to his lectures on Sundays.8. He reviews tge words every day. 9. Mary schows me her new pictures.

He works - he doesn"t work, I speak - I don"t speak. Если стоят местоимения he, she, it (или существительные и имена собственные, означающие  he, she, it), то в отрицании будет doesn"t и окончание s (напр. workS) в конце глагола убирается, а если I, we, you, то будет don"t .