"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".

'Want'

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.

'Guess'

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.

'Need'

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".

'Think'

Every word you use while working expresses something about your personal brand, your confidence, state of mind, authority and knowledge. The verbs that we put in sentences are key to our image at work.
Weak words used often can end up projecting us as weak.

Weak Words Used Often

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 confidence soar high.

'Suppose'

"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 phrase.

'Hope'

Sometimes it’s the smallest words and phrases that shape how you’re perceived around the office. Here are a few to watch out for at every level.


'Guess'

Similar ideas to 'Guess'

Toxic Work Environments

Emoji And Language

Why We Use Jargon