Think vs. Guess vs. Believe
'Think' and 'guess' and 'believe' are all used to indicate uncertainty about something but they differ in their level of uncertainty.
The main difference between 'think', 'guess', and 'believe' is in their level of certainty. 'Guess' suggests uncertainty and inference, while 'think' implies a higher level of certainty and reflection, and 'believe' conveys a stronger sense of conviction or confidence in the truth or possibility of something.
Level of Certainty
'Guess' implies a level of uncertainty or speculation based on subjective estimation. It suggests making an estimate or forming an opinion without definite evidence or full knowledge. On the other hand, 'think' generally implies a higher level of certainty or conviction based on more objective reasoning, information, and evidence. 'Believe' expresses a higher degree of confidence in and certainty of the truth or possibility of the statement.
If we consider certainty as a scale, 'guess' falls near the extreme of uncertainty, while 'think' is near the middle of the continuum and 'believe' is near the extreme of certainty.
I
'Guess' implies uncertainty and shows the speaker is making an inference without relying on any evidence.
I
'Think' implies a higher level of certainty, the speaker has probably considered the conditions and concluded that they can make it in time.
I
'Believe' expresses more certainty and confidence.
Expressing Opinions
'Guess', 'think', and 'believe' can all be used to express personal opinions, albeit still with different levels of certainty. They can be used to convey what one believes or considers to be the case based on their mental processes. Although 'think' is slightly more certain than 'guess', and 'believe' is, in turn, more certain than 'think', they all involve some level of uncertainty.
I
I
I