13. only(not, all, but, never) too …to do so 和"too ready (apt) + to do"结构中，不定式也没有否定意义，凡是"not"，"all""but等字后+"too…to，"不定式都失去了否定意义，在"too ready(apt) +to do"结构中，不定式也没有否定意义。You know but too yell to hold your tongue.

14. "no more …than…"句型

A home without love is no more a home than a body without a soul is a man.

15. "not so much…as"和"not so much as …"结构，"not so much…as"="not so much as …"，其中as有进可换用but rather，可译为："与其说是……毋须说是……"。而"not so much as"="without(not)even，"可译为"甚至……还没有"。

The oceans do not so much divide the world as unite it.

16. "Nothing is more…than"和"Nothing is so …as"结构，"Nothing is more…than"和"Nothing is so …as"都具有最高级比较的意思，"Nothing I"可换用"no"，"nobody"，"nowhere"，"little"，"few"，"hardly"，"scarcely"等等，可译为"没有……比……更为"，"像……再没有了"，"最……"等。

Nothing is more precious than time.

17. "cannot…too…"结构,"cannot…too…"意为"It is impossible to overdo…"或者，即"无论怎样……也不算过分"。"not"可换用"hardly"，"scarcely"等，"too"可换用"enough"，"sufficient"等。

You cannot be too careful.

18. "否定+but "结构，在否定词后面的"but"，具有"which not"，"who not"，"that not"，等等否定意义，构成前后的双重否定。可译成"没有……不是"或"……都……"等。

Nothing is so bad but it might have been worse.