use的适当形式:
used，useful， uses， useless
It was an intense but useless struggle .这是一场剧烈而无用的挣扎。
Further attempt at concealment was useless .再伪装下去就无意义了。
After this it was useless to resist .这一来，再挣扎也没有用啦。
It is useless your trying to evade the question .你用不着环顾左右而言他。
It was useless to prolong the discussion .继续争下去没有用。
