1)has, is going,stayed, was, может быть и то и то - любит или не любит математику - likes or doesn't like, play
2)E. had a very good day today, it's quarter to 8 in the evening, don't point at your book, B. didn't feed the monkeys, he gave M. some medicine, M. stayed at Bill's house
3) we didn't go - did we go?, he didn't stay - did he stay?, she didn't play - did she play?, he didn't have (или hadn't) - did he have (или had he)?, they didn't swim - did they swim?, you didn't like - did you like?