SpeakingThe need for variationThe most common word is of course "think": of course you will use it, but you do need to be able to use variations. It is extremely easy just to get stuck on the word "think" without knowing it. So have a look at the mindmap below which shows some of the potential variations, you do not need them all, but you do need a selection.
Neutral, certainty and doubtOne level of certainty you need is to be able to express how certain you are about what you say. Are you 100% sure or is it only a guess. Here are some of the basic options.
Green: neutral
Blue: certain
Pink: doubtful
You can expand the mindmap if you wish. You can also drag the words with your mouse.