句子成分To hand in homework on time is good.在这句话中to hand in动词不定式

to hand in动词不定式做主语啊.
动词不定式在句子中可做任何成分,但不能做谓语.
(1）动词不定式做主语
eg:To swim with you was very enjoyable.
注：动名词和动词不定式均可以做主语和表语,但动名词表示经常性的,抽象的动作,而不定式表示特指的一次性的具体的动作
(2）动词不定式做表语
eg:Her wish is to become a teacher.
注：表语为不定式时,主语也是不定式；当主语部分含有动词do时,做表语的不定式可以省略to.
eg:To see is to believe.
All you have to do is (to) study hard.
(3)不定式做宾语
以下及物动词后常用动词不定式：
want,decide,aim(目标),manage(试图),hope,ask,happen,like,love,choose,prevent(阻止),promise,continue,plan,learn,fail等.
eg:I decide to look for a job.
(4)动词不定式做定语
动词不定式做定语往往要后置,与被修饰词之间存在动宾关系、主谓关系、同位关系和修饰关系.如果动词不定式是不及物动词,应该在动词后加上适当的介词.如果被修饰词是地点、时间、方法,通常省略动词不定式后的介词.
eg:I have something to say.(动宾关系）
I was the last one to leave here.(主谓关系）
I have no wish to quarrel with you.(同位关系）
This is the best way to do that.(修饰关系）
I have nothing to worry about.(不及物动词后加介词）
I can't find a place to play (in).(省略介词in)
注：当名词用特定的定语如：frist,last,next,only等以及形容词最高级修饰时,后面用不定式修饰.
eg:He is the only person to know the truth.
(5）不定式做状语
不定式做状语主要表达结果、目的和原因.
eg:He worked day and night to play for the debts.(目的状语）
He woke up to find everyone gone.(结果状语）
We laughed to hear the news.(原因状语）
注：动词不定式与only连用时,可表出乎意料的结果.
eg:He went to seaside only to be drowned.
(6)动词不定式做补语
eg:Allow me to introduce her to you.

你写得说有的不定式，都是不定式作主语，谓语动词用单数。
When to meet 还是做主语，谓语动词同样用单数形式。

to hand in homework 在本句子中做主语。 不定式在句子中做什么成分关键看不定式在句子中的位置，不能一概而论。

1.to hand in on time作主语,不能分割开.
2.to be +adj可以作主语,表语,宾语等,要看具体的句子
eg: To be a student is not easy.
该句中 To be a student 作主语.
what i want is to be a student .
to be a student 作表语
3.后面几个也要看在什么句子中.

to hand in动词不定式作主语。
动词不定式在句子中可以充当的成分有：主语、宾语、表语、定语、状语、宾补。也就是说，除了谓语，其他任何成分都可以是动词不定式。不过有一点：不含特殊疑问词的动词不定式不能作介词的宾语。例：
His task is to clean the room. （表语）
I want to go out. (宾语）
I would like...

不定式做主语。

动词不定式做主语