thebesttime+todo还是doing

the best time+to do而不是doing

It is time to do：是该干…

它的扩展句，就是It's the best time to do

意思是“该是做某事的最佳时候了。”

如

It's the best time to plant trees in spring .

=It's the best time for planting trees in spring.

春天是植树的最佳时候

it is the best time to form good habits when in the youth. 年轻时候是培养好习惯的最佳时间。

英语中，如果名词前要最高级，序数词，以及the first the last 修饰时，后面再出现动词要用动词不定式而不是doing

例如：He became the first agricultural pioneer in the world to grow rice that has high output