1. Helena is by far the most talented dancer I have ever known (by far: rất nhiều (dùng với tính từ/ trạng từ so sánh hơn, so sánh nhất))
2. It goes without saying no one else in the conservatory play violin as well as Katie (doubtlessly: ko còn nghi ngờ gì)
3. As soon as he had got off the plane, he was taken into custody (disembarkation: sự rời tàu/máy bay, lưu ý vế "as soon as" dùng quá khứ hoàn thành nếu vế sau là quá khứ đơn)
GOOD LUCK!