E

1. This letter is /ɛ/ when,

It precedes two consonants:
to wet -> ta ɯette
to set -> ta sette
We set the table on Mondays. -> Uie sette þe tâble on Mondays.

It's the only vowel in the word:
E.g.
bed, sled, sped, ɯet
Sometimes, he sets the table. -> Somtîms hie sets þe tâble.
She set the table last. -> Sie sett þe tâble last.

It's the first stressed letter of a word:
elephant -> elifant
empty
elevator -> elevaitor
every -> evry

2. The combination eh is always /eɪ/:
E.g.
weight -> ɯeht
weigh -> ɯehe
sleigh -> sleh

3. -e is always silent at the end of words. It's most common in verbs, adjectives, and single syllable nouns.
E.g.
late -> lâte
time -> tîme
to combine -> ta combîne
to eat -> ta ite
to complete -> ta complite
to defeat -> ta defite
to seat -> ta síte
to sit -> ta sitte
to trim -> ta trimme

4. Inglish verbs ending in -ete, derived from Latin -atus, are unstressed /eɪ/.
These verbs originate from Latin participles ending in "-atus."
E.g.
demonstrare, demonstratus [Latin]
to demonstrate [Modern English]
ta demonstrete [Inglish]

insula, insulatus [Latin]
isolato [Italian]
isolé [French]
to isolate [Modern English]
ta îsolete [Inglish]

aemulari, aemulatus [Latin]
to emulate [Modern English]
ta em̃ulete [Inglish]

5. e is also typically /ə/ if it's not stressed
E.g.
taken -> tâken
to open -> ta open
to happen -> ta hapen
different -> diffrent
to sicken -> ta sicken




Citations:
https://www.etymonline.com/word/demonstrate#etymonline_v_29491
https://www.oed.com/dictionary/demonstrate_v?tab=pronunciation#7101723
https://latin-dictionary.net/definition/16548/demonstro-demonstrare-demonstravi-demonstratus

https://www.etymonline.com/word/isolated#etymonline_v_30103
https://www.etymonline.com/word/isolate#etymonline_v_12271
https://www.oed.com/dictionary/isolate_v?tab=pronunciation#40484371
https://www.littre.org/definition/isol%C3%A9
https://www.collinsdictionary.com/dictionary/italian-english/isolato
https://www.online-latin-dictionary.com/latin-english-dictionary.php?parola=insulatus
https://latin-dictionary.net/definition/24295/insula-insulae

https://www.etymonline.com/word/emulate#etymonline_v_29734
https://www.oed.com/dictionary/emulate_v?tab=factsheet#5546450
https://latin-dictionary.net/definition/1909/aemulor-aemulari-aemulatus