Oh, what a lovely question! The word "feather" has a long E sound, like the letter E in the word "bee." Isn't it wonderful how sounds can paint a beautiful picture in our minds? Just remember, there are no mistakes, only happy little accidents in the world of language.
"Threat" has a short e sound.
No. The E has a long E sound, as in he, me, and we.
That's a good question, because by the usual rules of English pronunciation, feather should have a long e sound, and if the word requires a short e sound it should be spelled fether instead. However, the English language is very complicated, and modern concepts of spelling and pronunciation evolved over a long period of time; many earlier concepts were different, and they have been preserved in the form of traditional spelling. Many people believe that English spelling should be reformed to make it more consistent, but so far that has not happened.
Yes. The E has a short E sound as in rest and bed.
No. It has a short A sound and a short I sound (man-ij). The E has no sound.
No, the word "jet" does not have a short e sound. It is pronounced with a short e sound, as in "eh."
No. There is a short U sound, and the A has a short I sound, but the E is silent.
No, the word "shell" does not have a short e sound. It is pronounced with a short e sound followed by the "l" consonant sound. The e in "shell" is pronounced like the e in "bed" or "tell."
No. There is no E or E sound. The I has a short I sound and the A is a schwa-R (ur).
Yes, the word "get" is pronounced with a short e sound.
Yes, the pronunciation of "seven" includes a short e sound.