When we use "I need" at the start of a sentence it sounds like pleading rather than empowered. It makes us sound needy.

Swap "I need" with "Please" to sound polite and confident.

We use "I think: often while at work, but it's a dysfunctional addition to a start of a sentence, that while ok to use occasionally in trivial situations, is to be avoided in meetings or one-on-ones. 

Try replacing it with "I'm confident".

"I hope" carries a big 'If', and it feels the speaker has no control over the outcome, conveying uncertainty, and can feel like the speaker is untrusting of the other person.

Replace "I hope" with "I look forward to" or a similar more confident-sounding p...

Guessing conveys a lack of surety. We use it to avoid lying or exaggerating, but it conveys our lack of knowledge.
Reframe that with '" expect" or "should" to convey confidence.

"I want" sounds emotional and lacking in confidence. 

It is better to use a conviction instead of a 'want', and replacing it with "I'm convinced" or "I believe".

Using 'I suppose so' indicates detachment and lack of interest. Use a more enthusiastic response like "Definitely".

Language is a powerful force and the words we use travel fast and can affect our reputation and influence. Using the right words can make our power and conf...