1、There is no saying such words.
不可能講這樣的話(huà)。

2、There is no saying when this war will come to an end.
天曉得這場(chǎng)戰(zhàn)爭(zhēng)何時(shí)會(huì)結(jié)束。

3、There is no saying what may happen.
簡(jiǎn)直不知今后情況會(huì)怎么樣。