to stand (up); to rise; to stand (in a position; of a person, tree, building, etc.); to be situated (in, on); to be (in difficulties, the lead, etc.); to put oneself (in a position or situation); to leave (to do something)
Examples (3 in total)
この本は我々に役にたつ。
This book is of great use to us.
私の辞書はとても役にたちます。
My dictionary is very useful.
それは本当に役にたつものですから、ぜひ買うべきです。
It's really a very useful thing; you ought to buy it.