from RAB:

Watch What You Say 

There are four verbal communication rules to remember in sales:

— Use descriptive language
— Use short sentences
— Avoid buzz words and jargon
— Avoid tag questions and qualifiers (“I guess,” “I hope,” “sorta,” “probably”)

When preparing your sales presentation, keep your points focused, so you don’t ramble on in long sentences. Adding tag questions (like “I think this is a good proposal, don’t you?”) weakens your position, and using words like “umm” and “like” and “you know” detract from what you are saying.

Think about what you really want to say, and then say exactly what you mean.

Source: Communication/sales consultant Marjorie Brody