請問一句 as if 中翻英 Lisa那時看起來好像曾經是Tom的女朋友 如果Lisa有可能真的是,要怎麼造 如果Lisa不是, 又要怎麼造 Thanks ^_^?

Lisa looked as if she had been Tom's girl friend.
as if子句要用「假設語氣」動詞。但口語可以用「直說語氣」。
「曾經是」：時間點位於過去之前（那時之前），所以用完成式動詞had been：之前是。

Lisa looked as if she were Tom's girl friend.
用were表示與「那時」同時間：當時是。
用簡單式動詞were。

「看起來好像是」或「看起來好像曾經是」都是「正面的肯定」。要表示「負面的否定」，加上not即可：Lisa looked as if she were not Tom's girl friend.或Lisa looked as if she had not been Tom's girl friend.