Hello，Teachers！that or when？

[Harry12345]

Hello，Teachers！that or when？

I can't forget the old days that we stayed in America.

I can't forget the old days when we stayed in America.

Thank you!

 

[emsr2d2]

Hello，Teachers！that or when？

I can't forget the old days that we stayed in America.

I can't forget the old days when we stayed in America.

Thank you!

When.

 

[Harry12345]

When.

emsr2d2;teacher Thank you!:-D

But why can't use that?