假如妳是李華，妳哥要去加拿大留學，想在渥太華與人合租房子恰好妳有壹筆友在那，讓妳給筆友寫信…包括問

This is Hua Li, how's going? I'd like to ask if you want to have a roommate and share one apartment with my brother, since he is going to Ottawa for studying recently. Please contact me as soon as possible.

Thank you for your time.

Yours Faithfully,

XXX

這是標準的工程學生的寫法，因為我是工程專業的。我們壹般給助教，教授寫信都大體是這樣的格式。差別無外乎是問候語的刪減。請留意。