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2 Perhaps Jan had worked for the railway for many years.
(might)
3 Gertruda was probably amazed when he opened his eyes.
(must)
4 I think the doctors didn't expect Jan to wake up. (may)
5 I don't think Jan had ever seen a mobile phone before. (can't)
6 I'm sure they are really enjoying life together now. (must)
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Answer :

blackshades

Answer:

2. Jan might have had worked for the railway for many years.

3. Gertruda must have been amazed when he opened his eyes.

4. The doctors may not have expected Jan to wake up.

5. I think Jan can't have seen a mobile phone before.

6. They must be really enjoying life together now.

Grammar used: Modal verbs.

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hope this helps!