Rewite the following sentences using the words in brackets
1. This is the worst experience I have ever had in my whole life. (before)
I have _______________

2. My mum last saw her granddaughter two weeks ago. (for)
My mum hasn't ____________

3. I have never seen such a good performance before. (so far)
It is _________

4. Betül hasn't been to a funfair for ages. (since)
it's ages ________​