[Grammar] useful to or for

[Will17]

Hello!

Is something useful to or for someone?

For example, if I say " Please, speak English, it's useful to me", is that correct?

Thanks a lot for your time
W

 

[bhaisahab]

Hello!

Is something useful to or for someone?

For example, if I say " Please, speak English, it's useful to me", is that correct?

Thanks a lot for your time
W

In your example "useful to" is correct but "useful for" also has its uses.