WHAT DOES NASCENCY ANTONYMS MEAN?

There aren't any negligible pairs for tense/lax pairs for instance /ʊ/ and /u/ in unstressed syllables, mainly because they are in complementary distribution. They are not actually different phonemes.I think You will find there's rule (with exceptions, naturally) about when the "ch" is throaty and when it can be mouthy. Right after an "open vowel"