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Active or passive voice
5) We have lost our keys. -
6) You might see dolphins here. -
7) The report must be completed by next Friday. -
8) They were singing a song in the lesson yesterday. -
9) A letter was written to her some days ago. -
10) The black bike is being repaired at the moment. -

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5) We have lost our keys. – Active Our keys have been lost. 6) You might see dolphins here. – Active Dolphins might been seen here 7) The report must be completed by next Friday. – Passive You must complete the report by next Friday. 8) They were singing a song in the lesson yesterday. – Active A song was being sung by them in the lesson yesterday. 9) A letter was written to her some days ago. – Passive He wrote her a letter some days ago. 10) The black bike is being repaired at the moment. – Passive They are repairing the black bike at the moment.