Question

there are 10 more trees to be planted，to be done 做什么成分

Answer 1

本句的不定式短语 to be planted 是名词 trees 的后置定语。不定式作后置定语与被修饰词有三种关系：

　　1）动宾关系：被修饰名词是不定式的逻辑宾语，例如 I have something to say（我有话要说）【= say something】
　　2）主谓关系；被修饰名词是不定式的逻辑主语，例如 He is the first to come every morning.（他是每天早晨第一个到的人）【=the first comes】
　　3）动状关系：被修饰名词是不定式的逻辑状语，如 This is the best way to do it（这是做这件事的良方）【=do it in the way】

本句的 trees 就是被动语态不定式的逻辑主语，相当于 three will be planted。

Answer 2

不定式to be planted做定语修饰trees

追答

1.不定式作定语,要放在所修饰的词的后面.如 Is this the best way to help him?
2.不定式作定语,与其被修饰的词在逻辑上有主谓关系、动宾关系或同位关系.如 He’s always the first one to get up.(主谓关系) / Please give me something to drink.(动宾关系) / The bike was broken before I had time to mend it.(同位关系)
3.当不定式作定语,且与被修饰的词有逻辑上的动宾关系时,不定式动词应该是及物动词；如果不定式动词为不及物动词,则该动词必须与介词连用,使其成为及物的短语动词.如 Because the room was very crowded,I needed a tall bench to stand on./ He wanted to find a new house to live in.

Answer 3

不定式作后置定语，修饰trees