On lesson 19 Level B eTeacher

I really like my current eTeacher. He is from Texas and I can understand his explanations and he understands when I say something weird.
I am still on level B and I am in lesson 19 Hitpael.
I like how Scott (my eTeacher) starts the class with a mini review of the last few chapters.

So Chap 15 is Piel verbs. They have an I vowel in the first root letter and a dagesh in the second root letter in the suffix  conjugations "Qatal and Weqtal (both future)" And in the Prefix Conjugations  it has an ah - ay vowel combination ( _ ..) it also has a Shewa in the prefix first letter.
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Chapter 16 is Pual verbs.  This is recognized by the uooo vowel in the first root letter with the suffix conjugations. If the verb ends in a vowel then the second root letter's vowel shortens to a silent shewa. The prefix conjugations still have an uooo in the first root letter. Pual is passive and has not infinitive and not imperative so there is no command in the Pual verb.

Chapter 17 was a review lesson. Lots of good reading. I love to read. I don't mind making mistakes because you always learn something when you make mistakes.

Chapter 18 is the Nifal Verb. This was the fist time that I really understood the Nifal. Nifal can be causative or reciprocal or reflexive. Mostly treat it a Passive with a little wiggle room. It can be recognized because it starts with a Nun and the vowel I in the Qatal and Weqatal, suffex conjugations. In the prefix conjugations (Yitqtol and Wayiqtol) alsso the Infinitive and Imperative the Nifal  the verb loses the Nun, as it assimilates and develops a "triangle" of heavy vowels at the front of the word. The Nun falls out because it is a weak letter.
In the Infinitive an Imperative the nun is assimilated in to the first root letter in the form of a degesh and again forms the nifal triangle, which is the heavy vowels as the front of the verb. They also have a hey with an I vowel.

Which brings us back to Chapter 19. The Hitpael verb is one of the three double stems. It is easy to recognize because of the H I T is prefixed to the verb. This conjugation has a dagesh in the second root letter. In the Yiqtol Wayyiqtol infinitive and imperative conjugations the H, I prefex is assimilated in to the tav and the tav aquires a shewa.