請幫我改這兩句英文(好簡單的)

Tom is to visit her grandfather next sunday in Taiwan,he can't attend the
English class on monday. - Please change to :
Tom is going to Taiwan next Sunday to visit his grandfather, therefore he will not be able to attend the English class every Monday until he returns.

Tom is used to drinking coffee when he feels tried. - This sentence has no problem.

在星期一Tom將妤參觀她的祖父下星期天在臺灣，他不可能上英語課。

當他感到試驗過時，Tom用於飲用的咖啡

Tom can not attend the English class on monday because he have to visit his (是他還是她? 他=his 她=her) grandfather in Taiwan next Sunday.

Tom is used to drinking coffee when he feels tired (口語上沒什麼問題, 意思是"他習慣累時喝咖啡吧"?)

Tom (is going to/will) visit his grandfather who lives in Taiwan next sunday thus he will not be able to attend the English class on monday

Tom is used to drink coffee when he was tired.

2008-07-31 16:42:31 補充：
第1句既意思應該係:

Tom會係星期日去Taiwan探佢grandfather, 所以佢星期一會返唔到英國班。

唔會係:

Tom會係星期日去Taiwan探佢grandfather, 但係佢星期一會返唔到英國班。

唔會用”ｂｕｔ”只會用有"所以"意思既字

e.g thus, so that, as a result...

2008-07-31 16:46:14 補充：
第一句又可以改成:

Tom will not be able to attend the English class since he is going to visit his grandfather who lives in Taiwan next sunday.

or簡單d就用其他回答者既answer

就咁用cannot同 in Taiwan next Sunday =]

2008-08-03 17:58:34 補充：
RE 005既答案

人地個句子意思只係話:

Tom會係星期日去Taiwan探佢grandfather, 所以佢星期一會返唔到英國班。

冇講過佢會個個星期一都唔返, 直至佢返黎wo=]

tom is going to visit his grandfather next Sunday in Taiwan, but he can't attend the English class on Monday.

Tom used to drink coffee when he feels tired.