更不用说 (gèng bùyòng shuō) means "let alone," and is used in the same way as the English, where we might say: "he can't even boil an egg, let alone prepare a banquet"
连 + A + 都 / 也 + Verb， 更不用说 + B + 了
Notice that the order used in this pattern is the opposite to the 别说 structure.
Unless the first action is negated with 没有, using 更不用说 generally requires using 了 to emphasize that the speaker is adding his/her own comment.