急你所急：
（1）English is spoken as a second language in many countries.（改给为主动语态：）
People (speak) (English) as a second language in many countries.(这里句子还用现在时，同上，指一种普遍且长期存在的现象
（2）The glass is used for keeping water hot（改主动语态）
They (use) the glass (for) keeping water hot.
（3）I think the most helpful invention is the light bulb.(对划线部分提问 划线部分是：the light bulb)
(What) (do) you think (is) the most helpful invention?
如对这几句还有疑问，可给我来信。
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