When I was young....

[subhajit123]

What's the difference between these sentences and are all these sentences correct?

1- When I was young, I always walked to school.


2- When I was young, I used to always walk to school.


3- When I was young, I would always walk to school.


And can 'would' be replaced with 'used to' in the following sentence?

4- I would/used to play football in the field.

 

[teechar]

What's the difference between these sentences, and are all these sentences correct?

They're all correct, and they basically mean the same. The broader context needs to be considered when deciding between them.

And can 'would' be replaced with 'used to' in the following sentence?

4- I would/used to play football in the field.

Again, it depends on the context.