He was killed by a heavy stone.He was killed with a heavy stone.
热心网友
前者强调“动作”，后者指“状态”，又如; be covered by, be covered with
热心网友
He was killed by a heavy stone. He was killed with a heavy stone. 他被一块重石头砸死啦。He was killed by a heavy stone. 强调是一块石头砸死的。He was killed with a heavy stone. 语气比第一句弱。
热心网友
2句话重点不一样,上面的强调了死因是一块重石下面的 则强调了 他死了~2句话 说话的对象 和说的场合可能不是一样的