Unit 14 Zoology [知識點撥]
e.g. he must have been there yesterday, wasn't he? he must have been there, hasn't he? he can't have been there yesterday, was he? he can't have been there, has he?
三、由上我們可以得出一個結論:表推測時,must只用在肯定句中,而 can只用于否定句和疑問句中。而實際上can可用于肯定句中,但這常用于表可能性,意義有所不同,譯為“有時候可能”。
e.g. old newspaper can be useful.
舊報紙有時候還是有用的。
it can get quite cold here at night.
晚上這里有時候會相當冷。