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3 Put each verb in brackets into the present simple or continuous, or the past simple or continuous.

1 'What (you do) __________ do you do __________?' 'I'm an engineer.'
2 The door was open so the dog (run) __________ ran __________ into the living room.
3 When we arrived home, Jan (sit) __________ was sitting __________ outside the door.
4 Can you help me? I (not understand) __________ don't understand __________ Spanish.
5 At the beginning of the film I (realize) __________ realized __________ I'd seen it before.
6 I'm sorry, I can't talk long. I (study) __________ am studying __________ for an examination.
7 At the moment of the earthquake Pat (read) __________ was reading __________ in bed.
8 I'll phone you as soon as I (know) __________ know __________ the results.
9 I (stay) __________ am staying __________ at the Hotel Tyrol. Why don't you call me?
10 'What (you do) __________ did you do __________ when you saw the snake?' 'I ran!'