在前面的解答中我提到：不定式作为非限定动词有体和时态的变化。这是笔误。“时态”应为“语态”。非限定动词是没有时态的。时态是动词“时”和“体”在形式和意义上的结合。只有限定动词才有时的变化形式，非限定动词则只有体的变化形式，没有时的变化形式。所以非限定动词是没有时态的，只有不同的体的形式和语态的形式。例如：一般体 (to) do, 进行体 (to) be doing, 完成体 (to) have done, 完成进行体 (to) have been doing。不定式也可以有被动语态，例如：(to) be done, (to) have been done。

(1) 你应该知道，进行体的构成是be doing, 即助动词be+现在分词。当你把be用作不定式，to be doing就是不定式的进行体。完成体为have done即助动词have+过去分词。to have done就是不定式的完成体。同理，to have been doing为不定式的完成进行体。只有最后一个实意动词根据具体动词采用相应的形式，助动词都是不能改动的。这是你学时态时的基本知识，本不该在这里提问的。你现在就像一个刚学会走路的小孩，想要飞奔，你不理解的东西很多。有些问题你该留到以后再深究，暂时把它们当作规则记忆使用即可。

(2) 当用动词不定式不同体和语态时，不定式前面的实意动词根据需要可用不同的时态，与不定式用什么体或语态没有直接关系。

seem是静态动词，不能用与进行体。

He seems/seemed to be angry. 不定式一般体

He seems/seemed to have a lot of momey. 不定式一般体

He seems/seemed to be writing a new book. 不定式进行体

He seems/seemed to have left. 不定式完成体

He seems/seemed to have been waiting for a long time. 不定式完成进行体

He seems/seemed to have been killed in a car accident. 不定式完成体被动语态

I want to marry you.

I wanted to marry you.

For ten years I have wanted/have been wanting to marry you.

I hope to be pormoted.

I was hoping to be promoted. t

I have been hoping to be promoted.

I plan to buy a car.

I planned to buy a car.

I had planned to come to the party, but I was sudden ill.

I planned to have come to the party, but I was sudden ill.

I am planning to buy a car.

不要重复提问类似的问题，否则不会有老师再解答你的问题。