いざという時役に立つよ。の英語

This will come in handy in a pinch.

This will come in handy in a pinch.

That sometimes helps out.

It is useful [comes in handy] on occasion.

That should help.

This should help.

This should be useful.

That won't help you.

That is helpful.

That is useful.

That looks helpful.

That ought to help.

This ought to help.

This will be helpful to you when you're grown up.

I hope this helps.

I hope this will answer your needs.

I am useless.

If I have that it will be a great help.

That looks very useful.

I hope this helps.

That excuse will not serve you.

That is very useful.

It is of great use.

This just might come in handy someday.

That is useful for me.

I hope that will be of use to you.

This will help you out.

be of (great) use

That is useful for me.

It is convenient for you there.