How do I complain to the jar app?

I see that the "washback effect" refers to the negative impact of testing on curriculum design, teaching practices, and learning behaviors. Could we use washback in other contexts, combined with other words? I can't find washback in the dictionary. :(

Looking for native speaker who could help me to improve my English and i can help in Arabic

Is this ok? We had a trip last week. I think it was fun. Should I say ‘I thought it was fun.’? Thanks

Is this ok? Last Sunday, I stayed at home and studied whole day. Thanks

Hi please help. We will have your results ready shortly. It means "will have" in this sentence He has someone to command?

Hi please help. I will have the champagne chilled prepared for you shortly. I will prepare the champagne chilled for you as soon as possible. Are these the same meaning? Thanks in advance

Which one is correct? (Level A1)

Let's test your knowledge about Colombia! Vote below! 🗳️ I'll share the answer later today!"