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A laptop was left in the cafeteria this morning. It was found by the another student and was given to the teacher. The owner was asked to come to the headteachers office to collect it. A lot of electronic gadgets were lost by students last month. Several of this was not returned to their owners, because the owners were not founded. You are reminded to be careful with laptop computers and smartphones.

A laptop was left by someone in the cafeteria this morning.

It was found by another student and it was given to the teacher (by her).

The owner was asked (by us) to come to the headteacher's office to collect it.

A lot of electronic gadgets were lost by students last month.  

Several of these were not returned to the owner by us, because the owners were not found by us.

You are reminded (by us) to be careful with laptop computers and smartphones.