15) 肯定句变否定句及疑问句要变化的一些词

　　1.some变为any。如：

　　There are some birds in the tree.→There aren't any birds in the tree.

　　但是，若在表示请邀请、请求的句子中，some可以不变。如：

　　Would you like some orange juice?

　　与此相关的一些不定代词如something, somebody等也要进行相应变化。

　　2.and变为or。如：

　　I have a knife and a ruler.→I don't have a knife or a ruler.

　　3.a lot of (=lots of)变为many或much。如：

　　They have a lot of friends.(可数名词)→They don't have many friends.

　　There is lots of orange in the bottle.(不可数名词)

　　→There isn't much orange in the bottle.

　　4.already变为yet。如：

　　I have been there already.→I haven't been there yet.

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