Word Formation Directions: S tudy the su ffix “ - ment” and then use the words given in the chart to complete the s entence s. The suffix" - ment" is often used with verbs to form nouns( 与动词结合成名词 ) . Model : For most businesses , your best investment can and should be in keeping your existing customers happy, rather than always chasing new customers . 2. I don't want to talk to him. Every discussion with him turns into a(n) ____________ .