Looking for ESL work?: Try our EFL / TOEFL / ESL Jobs Section!
Here's how you do it: I have not been to California so far. Or just yet by itself: I have not been to California yet.
The combination till yet makes no sense. You should not use that combination.
That is not the same as not using till and yet in the same sentence. For example, I can write this:
John has not come home yet, and he won't be home till 3 o'clock.
This usage has nothing to do with the usage you showed in the California example.
People are waiting to help.
Related forum topics: