1. some变为 any。如:
There are some birds in the tree.
→ There aren 39; 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 39; 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 39; t have many friends.
There is lots of orange in the bottle.(不可数名词)
→ There isn 39; t much orange in the bottle.
4. already变为 yet。如:
I have been there already.
→ I haven 39; t been there yet.