"sofar"是一个 现在完成时的标志词，用于表示从过去某个时间点开始一直持续到现在的动作或状态，并且这个动作或状态对现在有影响或者可能继续持续下去。例如：
1. So far, I have finished my homework.
2. So far, the project has been a success.
3. I have trusted him so far.