I used this link to practice on present perfect tense, and I have some questions:
Colin has left / left for Brazil this morning.
The correct answer is "left"; however, I think both answers are right, and it depends on the context. If we were still in the morning, then present perfect should be used, otherwise, use past simple because the morning period is already finished.
Ellen always write / has always written with her left hand.
I think using present perfect here is wrong because this is a simple fact, and present simple should be used.