Составьте предложение,используя настоящее или продолженное законченное время и слова "с тех пор" или на"1.We know each other.(for a long time)2.The lilttle boy feels bad.(since Friday)3. His parents live in New York.(since they got married)4.She plays table tennis.(for six years)5.Mr Marshall teaches English in Russia.(since 1999)6.I dream of going to Ausralia.(since I was a child)

1 We have known each other for a long time. 
2 The little boy has felt/has been feeling  bad since Friday. (с feel можно использовать и present perfect и present perfect continuous , выбирать надо тот вариант как вас учат в школе )
3 His parents have been living in N Y since they got married.
4 Shes been playing table tennis for 6 years. 
5 Mr M has been teaching E in R since 1999.
6 I have been dreaming of going to A since I was a child.