她想唱歌用英语可以说 "She wants to sing in Engpsh."
其中, "She" 指她, "wants" 是 "想要" 的意思, "to" 是介词, "sing" 是 "唱歌" 的意思, "in" 是 "用" 的意思, "Engpsh" 是 "英语" 的意思.
例句:
"She wants to sing in Engpsh at the talent show next week." (她想在下周的才艺表演中用英语唱歌)
"She has been practicing her Engpsh so that she can sing in it more fluently." (她一直在练习她的英语，这样她就能更流利地用英语唱歌)