Questions

[belly_ttt]

1. What does delist mean?
2. /ae/ and /a:/, is there any differences in pronunciation?
3. Wrong vs wrongful, what is the differences in meaning of them? Likewise, Right vs Righteous?
4. Can we say: No change is needed instead of No changes are needed?

[Hi_there_Carl]

1) delist means to remove from a list
2) Minimal pairs for English - Listening Exercises - Listening Comprehension for the Pronunciation differences between the sounds 'ae' as in 'cat' and 'eh' as in 'let'
3) wrongful (adjective only) wrong (noun, verb, adjective or adverb)
right had many meanings see: Definition of right - Merriam-Webster Online Dictionary
but Righteous has just a couple see: Definition of righteous - Merriam-Webster Online Dictionary

4) No change is (one change) No changes are needed (more than one change)

[belly_ttt]

Hi there, Carl.
I wanted to know the differences between /ae/ and /a:/ , when you pronounce, if people don't see your mouth moving, the sounds are very very alike, aren't they? So how to distinguish them?