[Grammar] Would/ used to/ past simple

[maral55]

Is it correct if I say

They often used to worry about him.

or

They often would worry about him.

or

They would often worry about him.


Is there a difference?

 

[bhaisahab]

Is it correct if I say

They often used to worry about him.

or

They often would worry about him.

or

They would often worry about him.


Is there a difference?

They often used to worry about him.
They would often worry about him. These two have the same meaning.