1> it Usage of

1.1> Instead of words , The phrase , The sentence

She left a message on my dest, but I couldn’t understand it.
She left a message on my desk , But I don't understand .

• understand transitive verb , There must be an object ;

He tried to fix his bike,but it isn’t easy.
He tried to repair his bike , But it's not easy .

• it Instead of to fix his bike Infinitive phrases ;

He like eating sweets, but he doesn’t admit it.
He likes to eat sweets , But he just doesn't admit .

• admit transitive verb , There must be an object ;
• it Instead of he like eating sweets The whole thing .

1.2> Of time , distance , The weather

What day is it today?
What day is today ？

What time is it?
What time is it
It’s one to three.
In another 1 Minutes. 3 O 'clock .

How far is it from here to the nearest bus stop?
How far is it from here to the nearest bus stop ？