更不用说【gèng búyòng shuō】

更不用说 follows a statement and adds a second case that's even more obviously true, so there's no need to argue it. The first clause often has 连…都 or 都, and 了 can close the sentence.

It works in positive sentences too, where English says "not to mention".

更别说 is a shorter, more casual form.

更不用说 or 别说

别说 opens the sentence with the bigger case. 更不用说 comes second and adds it. The meaning is the same; the order isn't.

• × 更不用说开车，我连自行车都不会骑 → 我连自行车都不会骑，更不用说开车了

Which case goes second

The case after 更不用说 has to follow from the first, not the other way round. If you can't do the easy thing, you can't do the hard one.

• × 我不会开车，更不用说骑自行车了 → 我连自行车都不会骑，更不用说开车了