"So far he hasn't called"
"the sun isn't up yet"
"no suspect has been found to date"
1. 到目前为止:unwanted side effects 有害的副作用 |uptonow 到目前为止 |upgrade the stock's rating 提升了股票的等级
2. 到现在为止:Uptonow nobody has claimed the suitcase.到现在还没人认领这个行李箱. |Uptonow 到现在为止 | I won't claim credit for it. 功劳不在我,credit 名声
3. 至今:owingto 因为 |uptonow 至今 | Chambers of commerce in foreign countries 在外国的商会
4. 直到现在:unspoken adj.未说出口的;非口语的 |uptonow 直到现在 | various adj.不同的;各种各样的