In the following sentence, what I wanted to express was that I am writing this letter to let the reader know that I lost my smart watch last week. What confuses me is whether I should use present perfect or past tense in the following sentence to talk about an event that was happened last week. My point is I know we should use past tense to talk about something if we know when it occurred. However, in this scenario, I don't know exactly when that happened.
I am writing to let you know about the smart watch that has been lost / which was lost last week when I was on holiday and claim the cost the item.
Losing something is a one-time completed event, unless it is something that happens frequently! g. I am always losing my reading glasses.
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Losing something is a one-time completed event, unless it is something that happens frequently!
e.g.
I am always losing my reading glasses.
For completed events, use the simple past. It does not matter exactly when or where it happened.
I am writing to let you know that I lost my smart watch last week when I was on holiday. It was insured from loss or