我沒接觸過外國人英語怎麼寫

Can you suggest how I might contact him?

我怎麼才能聯絡上他，你能出個主意嗎？

I've been trying to contact you all day.

我整天一直在設法與你聯絡。

How did you make contact with the author?

你怎麼跟這位作者聯絡的？