第1个回答 2013-03-13
"1. We were not able to finish this work until last week. " (主动语态）
"This work wasn't done (by us) till last week." (被动语态）
“2. I believe that daily physical exercise is necessary."
" I believe that it is necessary to do physical exercise every day."
”3. He is able to speak several foreign languages."
"He knows several foreign languages."
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第2个回答 2013-03-13
We didn't finish this task until last week。
I think it is necessary to do daily exercises.
He understands several foreign languages.
第3个回答 2013-03-14
We didn't finish this work until last week.
I think it's necessary to do physical exercise everyday.
He knows several foreign languages.