* This advice was very valuable ... me., * This advice was very valuable for me., * The training was valuable ... new employees., * The training was valuable for new employees., * Her help was invaluable ../.. the team., * Her help was invaluable to/for the team., * This treatment is effective ... many patients., * This treatment is effective for many patients., * This book is useful .. beginners., * This book is useful for beginners., * This tool is useful .. solving problems., * This tool is useful in solving problems., * She is very effective .. managing large teams., * She is very effective in managing large teams., * He is effective ... solving conflicts., * He is effective at/in solving conflicts., * Technology is useful .. improving communication., * Technology is useful in improving communication., * This guide is useless .. beginners., * This guide is useless for beginners., * I'm useless ... cooking., * I'm useless at cooking., * That meeting was a waste of time .. everyone., * That meeting was a waste of time for everyone., * The medicine was ineffective ... many patients., * The medicine was ineffective for many patients., The plan was ineffective ... reducing costs., The plan was ineffective in reducing costs., * His comments were unhelpful ... the discussion., * His comments were unhelpful for the discussion., * His advice was unhelpful .. me., * His advice was unhelpful to/for me..

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