This is very useful.

This book is useful.

This is useful information.

This website is very useful.

This book is really useful.

This dictionary is very useful.

This, in itself, is useful.

Now, why is this useful

This is a very useful book.

This one is a useful one.

Now, why is this so useful?

Sal, when is this multiplication thing even useful? And this is where it's useful. Sometimes it simplifies counting.

This dictionary is as useful as yours.

This phrasebook is very useful to me.

This book is very useful for us.

This definition is useful in many ways.

This is not only useful for stadia.

This one, I mean this is a useful one.

This dictionary is as useful as that one.

I think this dictionary is useful for beginners.

Is this promoting the progress of useful arts?

A useful model for this approach is at hand.

This book is much more useful than that one.

This driver is too small and isn't very useful.

This quirk is useful for things like FPU support.

The Secretary General considers that this is a useful recommendation.

I don't know if this 4 o'clock is useful yet.

Why is this useful, or what does it tell us?

This is particularly useful for checking tools before critical operations

This, by the way, is a useful comment here, right?

This is why I think what we've learned so far is useful.

This is useful, because C7 is the V (five) chord of F

You may find this useful.

Thanks for this useful information.

Antiperspirant is useful.

The listing of prospective items is most useful in this regard.

Like many such distinctions, this one is both useful and problematic.

Well, some programming experience is useful, we do this in Python.

You'll find this map very useful.

This dictionary isn't useful at all.

And you may find this useful.

Speaking English is useful.

Electricity is very useful.

Learning French is useful.

Sometimes violence is useful.