I guess (something is true)
Use "I guess..." to express that you've just started to think something. For example, you can use it when:
- you read the instructions for something, and now you think you can explain how to do it
- a friend has been trying to convince you to go to a party, and you've finally been convinced to go
- you've been waiting for a long time for someone to call you, and now you've decided that they're not going to call.
Here are some examples:
Hmm. They're not here. I guess they got tired of waiting.