Viết lại câu thì hiện tại hoàn thành và quá khứ đơn: My mother was the most warm-hearted person I've know

1.My mother was the most warm-hearted person I've know.
=>I have………
2.I haven't been to see them for over a year.
=>It is ………
3.The police started looking for him two months ago.
=>For to months now the………