Put the verbs in brackets into past forms 1/ Sam... (try) to fix his computer for three hours before he decided to call a professional. 2/ We...( prepare) everything before guests came. 3/ ...(John/ help) you with the dinner party last night? 4/ When I ...( call) her, she...(not/go) to bed yet. 5/ When....( Jane) graduate) from university? 7/ Tom was happy because he... find) a new job. 8/ Laura... read) the report, switched off her computer and went home.

Here are the sentences with the verbs in the correct past forms:

1. Sam tried to fix his computer for three hours before he decided to call a professional.
2. We prepared everything before the guests came.
3. Did John help you with the dinner party last night?
4. When I called her, she had not gone to bed yet.
5. When did Jane graduate from university?
6. Tom was happy because he had found a new job.
7. Laura read the report, switched off her computer, and went home.

(There was a numbering error, as the number 6 was skipped. I've replaced it with the correct number 6.)