Question

составьте четыре предложения с этими словами:1)did/who/see/you/in/the street?
2)why/they/did/late/come back?3)do/she/what//does/here?4)will/he/fly/to london/when?

Answer 1

1) Who did you see in the street?
2) Why did they come back late?
3) What does she do here?
4) When will he fly to London? 

Answer 2

whom did you see in the street?
why did they come back late?
what does she want here?
when will he fly to London?