Ask special questions to underlined words.
I got (my) university (degree) last month.
Bill was writing (a letter) at this time (yesterday).
(We) have just managed to talk to the (headmaster).

What university degree did you get
What was Bill writing at this time yesterday
Who has just managed to talk to the headmaster
What did you get
When was Bill was writing a letter
Who have you just managed to talk to