Изменить предложения по временам pr.s p.s f.s pr.perfect pr.c p.c предложения 1)people all over the world know and love his ballet music. 2)by the end of his life, in the late 19th century, tchaikovsky visited erope and the usa. 3)the next twelve years of his life he devoted to teaching and taught students at the moscow conservatory

1) if you    are  busy, i    i will    leave you alone. if you   were  busy, i    i  would    leave you alone. if you   had been  busy, i    i  would have    leave you alone 2) if i am not  busy  i will go    to the concert.,  if i wasn't  busy,i  would    go    to the concert.  if i  had  not  been  busy, i would have  gone  to the concert. 3) if i   get a ticket, i  will   go to the concert.  if i   got a ticket, i  would  go to the concert.  if i  had  got a ticket, i  would  have  gone    to the concert.  4) if i live near a wood, i  will   gather a lot of mushrooms.if i lived near a wood, i  would  gather a lot of mushrooms. if i  had  lived near a wood, i  would  have  gatherd a lot of mushrooms. 5) if my father returns early, we  will  watch tv together   if my father returned early, we  would  watch tv together .  if my father  had  returned early, we  would  have  watch tv together