Fragen über die Beispielsätze mit, und die Definition und Benutzung von "Currect"

A: There have been frequent power cuts lately

A: The correct sentence would be “I arrived when she left.”

Saying “I have” or “I had” changes the tense.

Saying “I have arrived” really isn’t used all that much, but it would be used in the tense that you just arrived, like in “I have just now arrived”

Saying “I had arrived” means that you “had already arrived”, meaning that you were already there/had already arrived.

The reason why the correct sentence is “I arrived when she left” is because in general, you have to keep the tenses the same, although it does depend on what exactly you are wanting to say. But in general, I would say that the sentence you are most likely trying to say would be “I arrived when she left” meaning that you arrived at the same time as she was leaving. Although, you could also say “I arrived when she had already left” to mean that you arrived some time later, after she had already left.

A: "Any assignments" is correct in a question like "Do you have any assignments?" (talking about many assignments) but "any assignment" is correct in a statement like "I would be happy to try any assignment" (talking about one assignment).